r/aws_backup_plan: add rule attribute to data source

[nikhil-goenka]

Description

Relations

Closes #28228

References

Output from Acceptance Testing

% make testacc TESTS=TestAccBackupPlanDataSource_basic PKG=backup
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.2 test ./internal/service/backup/... -v -count 1 -parallel 20 -run='TestAccBackupPlanDataSource_basic'  -timeout 360m
=== RUN   TestAccBackupPlanDataSource_basic
=== PAUSE TestAccBackupPlanDataSource_basic
=== CONT  TestAccBackupPlanDataSource_basic
--- PASS: TestAccBackupPlanDataSource_basic (23.89s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/backup	44.531s

...

[github-actions]

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[johnsonaj]

LGTM 🚀

% make testacc TESTS=TestAccBackupPlanDataSource_basic PKG=backup

make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.22.4 test ./internal/service/backup/... -v -count 1 -parallel 20 -run='TestAccBackupPlanDataSource_basic'  -timeout 360m
=== RUN   TestAccBackupPlanDataSource_basic
=== PAUSE TestAccBackupPlanDataSource_basic
=== CONT  TestAccBackupPlanDataSource_basic
--- PASS: TestAccBackupPlanDataSource_basic (12.86s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/backup	18.516s

[johnsonaj]

@nikhil-goenka thank you for the contribution! 🎉

[github-actions]

This functionality has been released in v5.57.0 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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