[TASK] Cleanup EXT:version

* Update phpDoc where needed
* Import use statements where possible

Resolves: #59857
Releases: 6.3, 6.2
Change-Id: I786db3b377dbe0cc90441ea6618ce05fc67b087b
Reviewed-on: https://review.typo3.org/31349
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring