resource/aws_appstream_stack: Fix panic on read

[gdavison]

Reading an aws_appstream_stack causes a panic.

Adds validation and improves tests

Relations

Closes #27228

References

Output from Acceptance Testing

$ make testacc PKG=appstream TESTS=TestAccAppStreamStack_

--- PASS: TestAccAppStreamStack_basic (23.86s)
--- PASS: TestAccAppStreamStack_disappears (26.55s)
--- PASS: TestAccAppStreamStack_applicationSettings_removeFromDisabled (39.51s)
--- PASS: TestAccAppStreamStack_complete (50.26s)
--- PASS: TestAccAppStreamStack_withTags (52.54s)
--- PASS: TestAccAppStreamStack_applicationSettings_removeFromEnabled (56.85s)
--- PASS: TestAccAppStreamStack_applicationSettings_basic (78.10s)

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccAppStreamStack_' PKG=appstream ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/appstream/... -v -count 1 -parallel 2  -run=TestAccAppStreamStack_ -timeout 180m
=== RUN   TestAccAppStreamStack_basic
=== PAUSE TestAccAppStreamStack_basic
=== RUN   TestAccAppStreamStack_disappears
=== PAUSE TestAccAppStreamStack_disappears
=== RUN   TestAccAppStreamStack_complete
=== PAUSE TestAccAppStreamStack_complete
=== RUN   TestAccAppStreamStack_applicationSettings_basic
=== PAUSE TestAccAppStreamStack_applicationSettings_basic
=== RUN   TestAccAppStreamStack_applicationSettings_removeFromEnabled
=== PAUSE TestAccAppStreamStack_applicationSettings_removeFromEnabled
=== RUN   TestAccAppStreamStack_applicationSettings_removeFromDisabled
=== PAUSE TestAccAppStreamStack_applicationSettings_removeFromDisabled
=== RUN   TestAccAppStreamStack_withTags
=== PAUSE TestAccAppStreamStack_withTags
=== CONT  TestAccAppStreamStack_basic
=== CONT  TestAccAppStreamStack_applicationSettings_removeFromEnabled
--- PASS: TestAccAppStreamStack_basic (21.20s)
=== CONT  TestAccAppStreamStack_withTags
--- PASS: TestAccAppStreamStack_applicationSettings_removeFromEnabled (34.20s)
=== CONT  TestAccAppStreamStack_complete
--- PASS: TestAccAppStreamStack_complete (35.46s)
=== CONT  TestAccAppStreamStack_applicationSettings_basic
--- PASS: TestAccAppStreamStack_withTags (36.72s)
=== CONT  TestAccAppStreamStack_applicationSettings_removeFromDisabled
--- PASS: TestAccAppStreamStack_applicationSettings_removeFromDisabled (24.38s)
=== CONT  TestAccAppStreamStack_disappears
--- PASS: TestAccAppStreamStack_disappears (13.85s)
--- PASS: TestAccAppStreamStack_applicationSettings_basic (52.97s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/appstream	102.175s

[github-actions]

This functionality has been released in v4.36.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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