Tech debt: r/aws_neptune_event_subscription: Use waiters package

[ewbankkit]

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Description

Relates #13214.
Relates #12840.

An aws/internal/service/neptune/waiter package was added in #13214, but used just in the test sweeper. Refactor the resource's code to use this package.

New or Affected Resource(s)

• aws_neptune_event_subscription

[github-actions]

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[github-actions]

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