When dealing with personal data exports and erasure requests, it is important to have a log of all the requests for a specific person. This is often required to confirm when and how many times requests were completed and fulfilled properly.
This change allows a new request to be created after a previous data request has reached completed status (`request-completed`) instead of requiring admins to delete or re-initiate the existing request. The latter approach removes the historical log of requests for that user when creating a new request.
Full unit tests for the `wp_create_user_request()` function are also included.
Props garrett-eclipse, cc0a, birgire, desrosj.
Fixes#44707.
git-svn-id: https://develop.svn.wordpress.org/trunk@44906 602fd350-edb4-49c9-b593-d223f7449a82
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