Translate user picker property editor value to V14 compatible format (and back again) #16151
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Prerequisites
Description
This is the user equivalent of #16149
The user picker property editor stores the integer ID of the picked user. However, the V14 client needs the user key to resolve the user data in the editor UI, so we need to translate the value back and forth.
Note that we still need to retain the integer ID when storing data. Eventually we should migrate this, but a content migration is not desirable for V14.
Testing this PR
The user picker property editor UI should work and should be able to store and retrieve a picked user.