fix Planner Plan and Bucket edit/delete with eTag management

[JMTeamway]

Category

• Bug fix?
• New feature?
• New sample?
• Documentation update?

Related Issues

fixes #1033

What's in this Pull Request?

Uses the new IUpdateableWithETag, IDeleteableWithETag interfaces for both Buckets and Plans

• Please update this PR information accordingly. We'll use this as part of our release notes in monthly communications.
• Please target your PR to "dev-v2" branch for v2 changes and "version-1" branch for v1 changes
  => ok
• Please ensure you have updated any associated docs files based on your code changes
  => ok
• Please ensure you have updated/added tests to cover your change.
  => NOT OK. Don't know how to do so.
• If you are fixing a bug include a test that would have caught the bug you are fixing
  => NOT OK. Don't know how to do so.

[patrick-rodgers]

Thanks!