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#### Summary <!-- Provide a general summary of your changes -->
Remove setup of Email Inbox retention policy and only add it to the
Allowed Tables.
This has been a cause of upgrade failures.

#### Work Item(s) <!-- Add the issue number here after the #. The issue
needs to be open and approved. Submitting PRs with no linked issues or
unapproved issues is highly discouraged. -->
Fixes
[AB#559547](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/559547)