r/backup_vault_policy: add iam retry for eventual consistency

[nam054]

Description

Add iam retry for eventual consistency.

Relations

Closes #33173

References

Output from Acceptance Testing

> make testacc TESTS=TestAccBackupVaultPolicy_eventual_consistency PKG=backup
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/backup/... -v -count 1 -parallel 20 -run='TestAccBackupVaultPolicy_eventual_consistency'  -timeout 360m
=== RUN   TestAccBackupVaultPolicy_eventual_consistency
=== PAUSE TestAccBackupVaultPolicy_eventual_consistency
=== CONT  TestAccBackupVaultPolicy_eventual_consistency
--- PASS: TestAccBackupVaultPolicy_eventual_consistency (28.91s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/backup     32.108s

...

[github-actions]

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[github-actions]

Thank you for your contribution! 🚀

A new usage of AWS SDK for Go V1 was detected. Please prefer AWS SDK for Go V2 for all net-new services. If this is an enhancement or bug fix to an existing AWS SDK Go V1 based resource, this comment can be safely ignored.

For additional information refer to the AWS SDK for Go Versions page in the contributor guide.

[johnsonaj]

LGTM 🚀

% make testacc TESTS=TestAccBackupVaultPolicy_eventualConsistency PKG=backup
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/backup/... -v -count 1 -parallel 20 -run='TestAccBackupVaultPolicy_eventualConsistency'  -timeout 360m
=== RUN   TestAccBackupVaultPolicy_eventualConsistency
=== PAUSE TestAccBackupVaultPolicy_eventualConsistency
=== CONT  TestAccBackupVaultPolicy_eventualConsistency
--- PASS: TestAccBackupVaultPolicy_eventualConsistency (71.10s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/backup	74.307s

[github-actions]

This functionality has been released in v5.30.0 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.