feat: add support for SingleSignOn login.

[i4ki]

What this PR does / why we need it:

Implements terramate cloud login --sso for Single-Sign-On login.

Which issue(s) this PR fixes:

none

Special notes for your reviewer:

Does this PR introduce a user-facing change?

yes, adds a new flag to `terramate cloud login`

[github-actions]

2025/03/11 20:30:17 Terraform detected version: 1.11.1
toolsetPath: /tmp/cmd-terramate-test-2256932157
=== RUN   TestInteropCloudSyncPreview
=== RUN   TestInteropCloudSyncPreview/preview:_basic-drift
    interoperability_test.go:46: using GITHUB_EVENT_FILE=/home/runner/work/_temp/_github_workflow/event.json
=== RUN   TestInteropCloudSyncPreview/preview:_basic-drift-uppercase-id
    interoperability_test.go:46: using GITHUB_EVENT_FILE=/home/runner/work/_temp/_github_workflow/event.json
--- PASS: TestInteropCloudSyncPreview (12.14s)
    --- PASS: TestInteropCloudSyncPreview/preview:_basic-drift (6.31s)
    --- PASS: TestInteropCloudSyncPreview/preview:_basic-drift-uppercase-id (5.83s)
=== RUN   TestInteropSyncDeployment
=== RUN   TestInteropSyncDeployment/deployment:_empty
=== RUN   TestInteropSyncDeployment/deployment:_empty-uppercase-id
--- PASS: TestInteropSyncDeployment (36.93s)
    --- PASS: TestInteropSyncDeployment/deployment:_empty (18.78s)
    --- PASS: TestInteropSyncDeployment/deployment:_empty-uppercase-id (18.15s)
=== RUN   TestInteropDrift
=== RUN   TestInteropDrift/drift:_basic-drift
=== RUN   TestInteropDrift/drift:_basic-drift-uppercase-id
--- PASS: TestInteropDrift (59.79s)
    --- PASS: TestInteropDrift/drift:_basic-drift (29.82s)
    --- PASS: TestInteropDrift/drift:_basic-drift-uppercase-id (29.97s)
PASS
ok  	github.com/terramate-io/terramate/e2etests/cloud/interop	116.990s

[github-actions]

Preview of ubuntu-focal/go1.21 tests in dae4c20

🔍 View Details on Terramate Cloud

.
cloud
cmd/terramate/cli
cmd/terramate/cli/tmcloud/auth

[github-actions]

Preview of macos-ventura/go1.21 tests in dae4c20

🔍 View Details on Terramate Cloud

.
cloud
cmd/terramate/cli
cmd/terramate/cli/tmcloud/auth

[github-actions]

metric: time/op
ChangeDetection-4: old 4.11ms ± 5%: new 4.10ms ± 4%: delta: 0.00%
ChangeDetectionTFAndTG-4: old 13.8ms ± 3%: new 13.7ms ± 3%: delta: 0.00%
CloudReadLines-4: old 1.15ms ± 2%: new 1.13ms ± 3%: delta: -1.68%
CloudReadLine-4: old 7.13ms ± 2%: new 7.17ms ± 2%: delta: 0.58%
ListFiles-4: old 88.3µs ± 1%: new 88.6µs ± 1%: delta: 0.26%
Generate-4: old 1.57s ± 3%: new 1.57s ± 2%: delta: 0.00%
GenerateRegex-4: old 1.09s ± 3%: new 1.08s ± 3%: delta: 0.00%
TokensForExpressionComplex-4: old 1.27ms ± 0%: new 1.27ms ± 1%: delta: 0.25%
TokensForExpressionPlainStringNoNewline-4: old 798ns ± 1%: new 798ns ± 1%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 24.1µs ± 2%: new 24.1µs ± 2%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 1.46ms ± 1%: new 1.46ms ± 1%: delta: 0.00%
TokensForExpression-4: old 1.28ms ± 1%: new 1.27ms ± 1%: delta: -0.33%
PartialEvalComplex-4: old 552µs ± 2%: new 553µs ± 2%: delta: 0.00%
PartialEvalSmallString-4: old 3.95µs ± 1%: new 3.95µs ± 1%: delta: 0.00%
PartialEvalHugeString-4: old 1.96ms ± 2%: new 1.93ms ± 1%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 5.07ms ± 2%: new 5.10ms ± 2%: delta: 0.00%
PartialEvalObject-4: old 27.6µs ± 2%: new 27.4µs ± 1%: delta: -0.57%
TmAllTrueLiteralList-4: old 636µs ± 0%: new 630µs ± 1%: delta: -0.86%
TmAllTrueFuncall-4: old 20.9µs ± 1%: new 20.8µs ± 1%: delta: 0.00%
TmAnyTrueLiteralList-4: old 4.95ms ± 0%: new 4.93ms ± 1%: delta: -0.25%
TmAnyTrueFuncall-4: old 21.3µs ± 1%: new 21.2µs ± 1%: delta: 0.00%
TmTernary-4: old 2.54µs ± 1%: new 2.56µs ± 1%: delta: 0.63%
TmTryUnknownFunc-4: old 2.30µs ± 1%: new 2.31µs ± 1%: delta: 0.32%
TmTryUnknownVariable-4: old 2.22µs ± 0%: new 2.22µs ± 1%: delta: 0.33%
TmTryUnknownObjectKey-4: old 2.54µs ± 1%: new 2.54µs ± 1%: delta: 0.00%
metric: alloc/op
ChangeDetection-4: old 357kB ± 0%: new 357kB ± 0%: delta: 0.00%
ChangeDetectionTFAndTG-4: old 4.81MB ± 0%: new 4.81MB ± 0%: delta: 0.00%
CloudReadLines-4: old 3.12MB ± 0%: new 3.12MB ± 0%: delta: 0.00%
CloudReadLine-4: old 3.37MB ± 0%: new 3.37MB ± 0%: delta: 0.00%
ListFiles-4: old 27.6kB ± 0%: new 27.6kB ± 0%: delta: 0.00%
Generate-4: old 2.24GB ± 0%: new 2.24GB ± 0%: delta: 0.00%
GenerateRegex-4: old 926MB ± 0%: new 926MB ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 395kB ± 0%: new 395kB ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 512B ± 0%: new 512B ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 12.5kB ± 0%: new 12.5kB ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 395kB ± 0%: new 395kB ± 0%: delta: 0.00%
TokensForExpression-4: old 395kB ± 0%: new 394kB ± 0%: delta: -0.00%
PartialEvalComplex-4: old 361kB ± 0%: new 361kB ± 0%: delta: -0.00%
PartialEvalSmallString-4: old 1.95kB ± 0%: new 1.95kB ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 196kB ± 0%: new 196kB ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 4.31MB ± 0%: new 4.31MB ± 0%: delta: 0.00%
PartialEvalObject-4: old 19.4kB ± 0%: new 19.4kB ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 321kB ± 0%: new 321kB ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 10.6kB ± 0%: new 10.6kB ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 2.09MB ± 0%: new 2.09MB ± 0%: delta: -0.00%
TmAnyTrueFuncall-4: old 10.7kB ± 0%: new 10.7kB ± 0%: delta: 0.00%
TmTernary-4: old 1.18kB ± 0%: new 1.18kB ± 0%: delta: 0.00%
TmTryUnknownFunc-4: old 784B ± 0%: new 784B ± 0%: delta: 0.00%
TmTryUnknownVariable-4: old 768B ± 0%: new 768B ± 0%: delta: 0.00%
TmTryUnknownObjectKey-4: old 952B ± 0%: new 952B ± 0%: delta: 0.00%
metric: allocs/op
ChangeDetection-4: old 2.48k ± 0%: new 2.48k ± 0%: delta: 0.00%
ChangeDetectionTFAndTG-4: old 33.8k ± 0%: new 33.8k ± 0%: delta: 0.00%
CloudReadLines-4: old 5.54k ± 0%: new 5.54k ± 0%: delta: 0.00%
CloudReadLine-4: old 60.0k ± 0%: new 60.0k ± 0%: delta: 0.00%
ListFiles-4: old 335 ± 0%: new 335 ± 0%: delta: 0.00%
Generate-4: old 25.7M ± 0%: new 25.7M ± 0%: delta: 0.00%
GenerateRegex-4: old 18.4M ± 0%: new 18.4M ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 4.83k ± 0%: new 4.83k ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 20.0 ± 0%: new 20.0 ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 227 ± 0%: new 227 ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 3.19k ± 0%: new 3.19k ± 0%: delta: 0.00%
TokensForExpression-4: old 4.83k ± 0%: new 4.83k ± 0%: delta: 0.00%
PartialEvalComplex-4: old 3.78k ± 0%: new 3.78k ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 26.0 ± 0%: new 26.0 ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 38.0 ± 0%: new 38.0 ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 26.1k ± 0%: new 26.1k ± 0%: delta: 0.00%
PartialEvalObject-4: old 183 ± 0%: new 183 ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 5.94k ± 0%: new 5.94k ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 275 ± 0%: new 275 ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 59.6k ± 0%: new 59.6k ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 277 ± 0%: new 277 ± 0%: delta: 0.00%
TmTernary-4: old 27.0 ± 0%: new 27.0 ± 0%: delta: 0.00%
TmTryUnknownFunc-4: old 21.0 ± 0%: new 21.0 ± 0%: delta: 0.00%
TmTryUnknownVariable-4: old 20.0 ± 0%: new 20.0 ± 0%: delta: 0.00%
TmTryUnknownObjectKey-4: old 23.0 ± 0%: new 23.0 ± 0%: delta: 0.00%