[FEATURE] Introduce event to prevent downloading of language packs

With the newly introduced event, it is possible to ignore extensions or
individual language packs for extensions when downloading the language
packs.

Resolves: #98394
Releases: main
Change-Id: I5ff3b3bcdc4de41338d6925412c81ccb1df022e3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77485


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>