Fix ecr_repository_prefix validation in aws_ecr_pull_through_cache_rule

[hikaru7719]

Description

Fixes validation of ecr_repository_prefix in aws_ecr_pull_through_cache_rule.
Referred to the latest AWS documentation and corrected the string size and regular expression pattern for ecr_repository_prefix.

Relations

Closes #34516

References

• https://docs.aws.amazon.com/AmazonECR/latest/APIReference/API_CreatePullThroughCacheRule.html

Output from Acceptance Testing

% make testacc TESTS=TestAccECRPullThroughCacheRule_ PKG=ecr          
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRPullThroughCacheRule_'  -timeout 360m
=== RUN   TestAccECRPullThroughCacheRule_basic
=== PAUSE TestAccECRPullThroughCacheRule_basic
=== RUN   TestAccECRPullThroughCacheRule_disappears
=== PAUSE TestAccECRPullThroughCacheRule_disappears
=== RUN   TestAccECRPullThroughCacheRule_failWhenAlreadyExists
=== PAUSE TestAccECRPullThroughCacheRule_failWhenAlreadyExists
=== RUN   TestAccECRPullThroughCacheRule_ecrRepositoryPrefixWithSlash
=== PAUSE TestAccECRPullThroughCacheRule_ecrRepositoryPrefixWithSlash
=== CONT  TestAccECRPullThroughCacheRule_basic
=== CONT  TestAccECRPullThroughCacheRule_failWhenAlreadyExists
=== CONT  TestAccECRPullThroughCacheRule_disappears
=== CONT  TestAccECRPullThroughCacheRule_ecrRepositoryPrefixWithSlash
--- PASS: TestAccECRPullThroughCacheRule_failWhenAlreadyExists (76.76s)
--- PASS: TestAccECRPullThroughCacheRule_disappears (78.29s)
--- PASS: TestAccECRPullThroughCacheRule_ecrRepositoryPrefixWithSlash (86.24s)
--- PASS: TestAccECRPullThroughCacheRule_basic (89.38s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ecr        89.466s

% make testacc TESTS=TestAccECRPullThroughCacheRuleDataSource_ PKG=ecr
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRPullThroughCacheRuleDataSource_'  -timeout 360m
=== RUN   TestAccECRPullThroughCacheRuleDataSource_basic
=== PAUSE TestAccECRPullThroughCacheRuleDataSource_basic
=== RUN   TestAccECRPullThroughCacheRuleDataSource_ecrRepositoryPrefixWithSlash
=== PAUSE TestAccECRPullThroughCacheRuleDataSource_ecrRepositoryPrefixWithSlash
=== CONT  TestAccECRPullThroughCacheRuleDataSource_basic
=== CONT  TestAccECRPullThroughCacheRuleDataSource_ecrRepositoryPrefixWithSlash
--- PASS: TestAccECRPullThroughCacheRuleDataSource_basic (92.56s)
--- PASS: TestAccECRPullThroughCacheRuleDataSource_ecrRepositoryPrefixWithSlash (92.84s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ecr        92.921s

[github-actions]

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[AdamTylerLynch]

LGTM 🚀

[jar-b]

LGTM 🎉

% make testacc PKG=ecr TESTS="TestAccECRPullThroughCacheRule_|TestAccECRPullThroughCacheRuleDataSource_"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ecr/... -v -count 1 -parallel 20 -run='TestAccECRPullThroughCacheRule_|TestAccECRPullThroughCacheRuleDataSource_'  -timeout 360m

--- PASS: TestAccECRPullThroughCacheRule_failWhenAlreadyExists (38.97s)
--- PASS: TestAccECRPullThroughCacheRule_disappears (40.54s)
--- PASS: TestAccECRPullThroughCacheRule_repositoryPrefixWithSlash (44.50s)
--- PASS: TestAccECRPullThroughCacheRule_basic (48.29s)
--- PASS: TestAccECRPullThroughCacheRuleDataSource_basic (61.69s)
--- PASS: TestAccECRPullThroughCacheRuleDataSource_repositoryPrefixWithSlash (62.41s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/ecr        65.740s

[github-actions]

This functionality has been released in v5.31.0 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]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.