ecr: ISO-friendly tagging

[YakDriver]

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Closes #18133
Relates #18593
Relates #22532

Output from acceptance testing (us-west-2):

% make testacc TESTS='TestAccECRRepository_|TestAccECRRepositoryDataSource_' PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRRepository_|TestAccECRRepositoryDataSource_'  -timeout 180m
--- PASS: TestAccECRRepositoryDataSource_nonExistent (3.85s)
--- PASS: TestAccECRRepositoryDataSource_basic (18.78s)
--- PASS: TestAccECRRepository_immutability (19.56s)
--- PASS: TestAccECRRepository_basic (19.65s)
--- PASS: TestAccECRRepositoryDataSource_encryption (22.34s)
--- PASS: TestAccECRRepository_tags (30.92s)
--- PASS: TestAccECRRepository_Encryption_aes256 (35.73s)
--- PASS: TestAccECRRepository_Encryption_kms (38.52s)
--- PASS: TestAccECRRepository_Image_scanning (45.24s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	46.752s

Output from acceptance testing (GovCloud):

% make testacc TESTS='TestAccECRRepository_|TestAccECRRepositoryDataSource_' PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRRepository_|TestAccECRRepositoryDataSource_'  -timeout 180m
--- PASS: TestAccECRRepositoryDataSource_nonExistent (4.89s)
--- PASS: TestAccECRRepositoryDataSource_basic (21.46s)
--- PASS: TestAccECRRepository_immutability (23.20s)
--- PASS: TestAccECRRepository_basic (23.36s)
--- PASS: TestAccECRRepositoryDataSource_encryption (26.15s)
--- PASS: TestAccECRRepository_tags (34.07s)
--- PASS: TestAccECRRepository_Encryption_aes256 (42.01s)
--- PASS: TestAccECRRepository_Encryption_kms (43.75s)
--- PASS: TestAccECRRepository_Image_scanning (52.82s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	54.141s

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccECRRepository_\|TestAccECRRepositoryDataSource_' PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20  -run=TestAccECRRepository_\|TestAccECRRepositoryDataSource_ -timeout 180m
=== RUN   TestAccECRRepositoryDataSource_basic
=== PAUSE TestAccECRRepositoryDataSource_basic
=== RUN   TestAccECRRepositoryDataSource_encryption
=== PAUSE TestAccECRRepositoryDataSource_encryption
=== RUN   TestAccECRRepositoryDataSource_nonExistent
=== PAUSE TestAccECRRepositoryDataSource_nonExistent
=== RUN   TestAccECRRepository_basic
=== PAUSE TestAccECRRepository_basic
=== 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  TestAccECRRepositoryDataSource_basic
=== CONT  TestAccECRRepositoryDataSource_encryption
=== CONT  TestAccECRRepository_tags
=== CONT  TestAccECRRepository_immutability
=== CONT  TestAccECRRepositoryDataSource_nonExistent
=== CONT  TestAccECRRepository_basic
=== CONT  TestAccECRRepository_Encryption_kms
=== CONT  TestAccECRRepository_Encryption_aes256
=== CONT  TestAccECRRepository_Image_scanning
--- PASS: TestAccECRRepositoryDataSource_nonExistent (4.67s)
--- PASS: TestAccECRRepositoryDataSource_basic (21.22s)
--- PASS: TestAccECRRepository_immutability (24.92s)
--- PASS: TestAccECRRepository_basic (24.92s)
--- PASS: TestAccECRRepositoryDataSource_encryption (28.63s)
--- PASS: TestAccECRRepository_tags (34.95s)
--- PASS: TestAccECRRepository_Encryption_aes256 (42.32s)
--- PASS: TestAccECRRepository_Encryption_kms (45.81s)
--- PASS: TestAccECRRepository_Image_scanning (51.07s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ecr	54.840s

[github-actions]

This functionality has been released in v3.72.0 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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