ECR - Add ability to query by and return most recent image tag(s)

[mtt88]

Add most_recent attribute to data source aws_ecr_image which will return the most recently pushed tag(s) for an ecr image.
Add most_recent_image_tags to data source aws_ecr_repository which will return the most recently pushed tag(s) for an ecr repository.

Questions:

How best to add tests for this new functionality? I've extended the existing tests in a limited way to check the existence of these new attributes but I am unsure how best to test that they are correct?
Do we want to add most_recent_image_tags to the aws_ecr_repository resource in addition to the data source?

Closes #12798.
Closes #26658.

Output from acceptance testing:

make testacc TESTS=TestAccECRRepositoryDataSource PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRRepositoryDataSource'  -timeout 180m
=== RUN   TestAccECRRepositoryDataSource_basic
=== PAUSE TestAccECRRepositoryDataSource_basic
=== RUN   TestAccECRRepositoryDataSource_encryption
=== PAUSE TestAccECRRepositoryDataSource_encryption
=== RUN   TestAccECRRepositoryDataSource_nonExistent
=== PAUSE TestAccECRRepositoryDataSource_nonExistent
=== CONT  TestAccECRRepositoryDataSource_basic
=== CONT  TestAccECRRepositoryDataSource_nonExistent
=== CONT  TestAccECRRepositoryDataSource_encryption
--- PASS: TestAccECRRepositoryDataSource_nonExistent (5.34s)
--- PASS: TestAccECRRepositoryDataSource_basic (24.90s)
--- PASS: TestAccECRRepositoryDataSource_encryption (29.48s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ecr        29.531s


 make testacc TESTS=TestAccECRImageDataSource PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRImageDataSource'  -timeout 180m
=== RUN   TestAccECRImageDataSource_ecrImage
=== PAUSE TestAccECRImageDataSource_ecrImage
=== CONT  TestAccECRImageDataSource_ecrImage
--- PASS: TestAccECRImageDataSource_ecrImage (26.71s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ecr        26.759s

[github-actions]

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[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccECRRepository_' PKG=ecr ACCTEST_PARALLELISM=3
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 3  -run=TestAccECRRepository_ -timeout 180m
=== RUN   TestAccECRRepository_basic
=== PAUSE TestAccECRRepository_basic
=== RUN   TestAccECRRepository_disappears
=== PAUSE TestAccECRRepository_disappears
=== RUN   TestAccECRRepository_tags
=== PAUSE TestAccECRRepository_tags
=== RUN   TestAccECRRepository_immutability
=== PAUSE TestAccECRRepository_immutability
=== RUN   TestAccECRRepository_Image_scanning
=== PAUSE TestAccECRRepository_Image_scanning
=== RUN   TestAccECRRepository_Encryption_kms
=== PAUSE TestAccECRRepository_Encryption_kms
=== RUN   TestAccECRRepository_Encryption_aes256
=== PAUSE TestAccECRRepository_Encryption_aes256
=== CONT  TestAccECRRepository_basic
=== CONT  TestAccECRRepository_Encryption_aes256
=== CONT  TestAccECRRepository_immutability
--- PASS: TestAccECRRepository_immutability (20.48s)
=== CONT  TestAccECRRepository_Encryption_kms
--- PASS: TestAccECRRepository_basic (20.67s)
=== CONT  TestAccECRRepository_tags
--- PASS: TestAccECRRepository_Encryption_aes256 (38.39s)
=== CONT  TestAccECRRepository_Image_scanning
--- PASS: TestAccECRRepository_Encryption_kms (35.21s)
=== CONT  TestAccECRRepository_disappears
--- PASS: TestAccECRRepository_tags (41.06s)
--- PASS: TestAccECRRepository_disappears (12.06s)
--- PASS: TestAccECRRepository_Image_scanning (42.06s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	85.790s
% make testacc TESTARGS='-run=TestAccECRRepositoryDataSource_' PKG=ecr ACCTEST_PARALLELISM=3
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 3  -run=TestAccECRRepositoryDataSource_ -timeout 180m
=== RUN   TestAccECRRepositoryDataSource_basic
=== PAUSE TestAccECRRepositoryDataSource_basic
=== RUN   TestAccECRRepositoryDataSource_encryption
=== PAUSE TestAccECRRepositoryDataSource_encryption
=== RUN   TestAccECRRepositoryDataSource_nonExistent
=== PAUSE TestAccECRRepositoryDataSource_nonExistent
=== CONT  TestAccECRRepositoryDataSource_basic
=== CONT  TestAccECRRepositoryDataSource_nonExistent
=== CONT  TestAccECRRepositoryDataSource_encryption
--- PASS: TestAccECRRepositoryDataSource_nonExistent (3.81s)
--- PASS: TestAccECRRepositoryDataSource_basic (16.31s)
--- PASS: TestAccECRRepositoryDataSource_encryption (18.35s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	23.452s
% make testacc TESTARGS='-run=TestAccECRImageDataSource_basic' PKG=ecr ACCTEST_PARALLELISM=3
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 3  -run=TestAccECRImageDataSource_basic -timeout 180m
=== RUN   TestAccECRImageDataSource_basic
=== PAUSE TestAccECRImageDataSource_basic
=== CONT  TestAccECRImageDataSource_basic
--- PASS: TestAccECRImageDataSource_basic (18.37s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	23.594s

[ewbankkit]

@mtt88 Thanks for the contribution 🎉 👏.
I could test the most_recent functionality for the aws_ecr_image data source by ensuring that it has the "latest" tag.

[github-actions]

This functionality has been released in v4.56.0 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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