Tech debt: r/aws_db_event_subscription: Use waiters package

[ewbankkit]

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Description

Relates #13213.
Relates #12840.

An aws/internal/service/rds/waiter package was added in #13213, but used just in the test sweeper. Refactor the resource's code to use this package.

New or Affected Resource(s)

• aws_db_event_subscription

[github-actions]

This functionality has been released in v3.61.0 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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