[BUGFIX] Listen to message when setting an avatar

Due to the IRRE rewrite done in #88182 the avatar selection for backend
users broke, since the Setup module doesn't use FormEngine, yet.

The controller now adds dedicated JavaScript to listen to the
`typo3:elementBrowser:elementInserted` message sent by the Element
Browser to set the file reference uid correctly.

Resolves: #89634
Related: #88182
Releases: master
Change-Id: I5e6a56b35891ab380634540e9ed5ef0b3a96f082
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62292


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>