[TASK] Add new file object to AfterFileCopiedEvent

The PSR-14 event "AfterFileCopiedEvent" in FAL now also
has the possibility to return the newly created file
and the identifier.

Resolves: #91373
Releases: master
Change-Id: I08a01a0424e37fe2f010d2894d41a14628bdc950
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64478


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Susanne Moog <look@susi.dev>