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#### Summary <!-- Provide a general summary of your changes -->
This filter allows each connector to parse and keep only the last
message of the email contents of emails retrieved. Email clients
automatically append the history messages when replying to an email.
Each connector still needs to implement this functionality.

#### 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#560747](https://dynamicssmb2.visualstudio.com/1fcb79e7-ab07-432a-a3c6-6cf5a88ba4a5/_workitems/edit/560747)