Move Windows compilation test to GHA and enable tests

[brandond]

Proposed Changes

• Move Windows compilation test to GH Actions
• Enable integration/coverage/smoke tests
• Fix multiple issues with windows configuration.

Part of ongoing efforts to improve Windows coverage by mainstreaming how we build and test for Windows.

Types of Changes

windows

Verification

check CI results

Testing

yes

Linked Issues

• Enhance Windows tests #11742
• [Windows] Address build script failures in k3s when running on Windows #9297
• [Windows] Document Windows k3s build requirements #9299
• [Windows] k3s Windows build should not require skip validation #9300

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 23.63636% with 42 lines in your changes missing coverage. Please review.

Project coverage is 46.77%. Comparing base (85b3775) to head (2d34a73).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/util/permissions/permissions_windows.go	0.00%	30 Missing ⚠️
pkg/cli/agent/agent.go	25.00%	2 Missing and 1 partial ⚠️
pkg/cli/server/server.go	25.00%	2 Missing and 1 partial ⚠️
pkg/util/permissions/permissions_others.go	40.00%	2 Missing and 1 partial ⚠️
pkg/agent/netpol/netpol_windows.go	0.00%	2 Missing ⚠️
pkg/agent/containerd/config.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11713      +/-   ##
==========================================
- Coverage   49.61%   46.77%   -2.84%     
==========================================
  Files         186      206      +20     
  Lines       19461    19483      +22     
==========================================
- Hits         9655     9113     -542     
- Misses       8410     9043     +633     
+ Partials     1396     1327      -69     

Flag	Coverage Δ
e2etests	40.36% <33.33%> (-3.71%)	⬇️
inttests	34.90% <27.77%> (-0.08%)	⬇️
unittests	16.29% <12.72%> (-0.66%)	⬇️

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