codegen: interpolated-string-keys test panics

[abhinav]

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Issue details

In upgrading to Pulumi v3.76 (#474), we discovered that the
interpolated-string-keys test panics for this repository:

--- FAIL: TestGenerateProgram (0.00s)
    --- FAIL: TestGenerateProgram/interpolated-string-keys (0.00s)
panic: interface conversion: ast.Expr is *ast.InterpolateExpr, not *ast.StringExpr [recovered]
        panic: interface conversion: ast.Expr is *ast.InterpolateExpr, not *ast.StringExpr

goroutine 10 [running]:
testing.tRunner.func1.2({0x1048ba720, 0x140005a8690})
        /opt/homebrew/Cellar/go/1.20.6/libexec/src/testing/testing.go:1526 +0x1c8
testing.tRunner.func1()
        /opt/homebrew/Cellar/go/1.20.6/libexec/src/testing/testing.go:1529 +0x384
panic({0x1048ba720, 0x140005a8690})
        /opt/homebrew/Cellar/go/1.20.6/libexec/src/runtime/panic.go:884 +0x204
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.(*typeCache).typeExpr(0x140005a8540, 0x14000649c80?, {0x104bac9e0?, 0x140005a80c0?})
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/analyser.go:1011 +0xfd0
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.walker.walk({0x14000511970, 0x14000511960, 0x14000511980, 0x14000511940, 0x14000511950}, 0x1061bc108?, {0x104bac9e0, 0x140005a80c0?})
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/analyser.go:1226 +0x210
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.walker.EvalConfig({0x14000511970, 0x14000511960, 0x14000511980, 0x14000511940, 0x14000511950}, 0x140001d3580, {0x104bb34a0?, 0x14000941b80?})
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/analyser.go:1240 +0x1b0
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.(*Runner).Run(0x140001d3580, {0x104bb5318?, 0x140005a8630})
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/run.go:835 +0x428
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.TypeCheck(0x140001d3580?)
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/analyser.go:1175 +0x1a8
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.PrepareTemplate(0x140001d3580?, 0x102d502c8?, {0x104baf1b8?, 0x14000583380?})
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/run.go:319 +0x128
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml.RunTemplate(0x2?, 0x140009a4800, 0x10?, {0x104baf1b8?, 0x14000583380})
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/run.go:331 +0x140
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml/codegen.TestGenerateProgram.func2.1(0x1400063ac60?)
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/codegen/gen_program_test.go:215 +0x30
github.com/pulumi/pulumi/sdk/v3/go/pulumi.RunWithContext(0x1400063ac60, 0x1400091f978)
        /Users/abg/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/go/pulumi/run.go:121 +0x154
github.com/pulumi/pulumi/sdk/v3/go/pulumi.runErrInner(0x104b9ffe0?, 0x104b8e9a0, {0x1400091f958, 0x2, 0x2?})
        /Users/abg/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/go/pulumi/run.go:97 +0x264
github.com/pulumi/pulumi/sdk/v3/go/pulumi.RunErr(...)
        /Users/abg/go/pkg/mod/github.com/pulumi/pulumi/sdk/[email protected]/go/pulumi/run.go:64
github.com/pulumi/pulumi-yaml/pkg/pulumiyaml/codegen.TestGenerateProgram.func2(0x14000583380, {0x14000670d80, 0x57}, 0x4?)
        /Users/abg/src/pulumi/yaml/pkg/pulumiyaml/codegen/gen_program_test.go:214 +0x1f8
github.com/pulumi/pulumi/pkg/v3/codegen/testing/test.TestProgramCodegen.func1(0x14000583380)
        /Users/abg/go/pkg/mod/github.com/pulumi/pulumi/pkg/[email protected]/codegen/testing/test/program_driver.go:635 +0x13a4
testing.tRunner(0x14000583380, 0x140005382d0)
        /opt/homebrew/Cellar/go/1.20.6/libexec/src/testing/testing.go:1576 +0x10c
created by testing.(*T).Run
        /opt/homebrew/Cellar/go/1.20.6/libexec/src/testing/testing.go:1629 +0x368
exit status 2
FAIL    github.com/pulumi/pulumi-yaml/pkg/pulumiyaml/codegen    0.046s

Affected area/feature