[BUGFIX] Fix event handler invocation in language pack download

LanguagePackService is supposed to dispatch events that third party
extensions can handle. The service instance therefore needs to be
factored thorugh the late-booted symfony container, in order for
event handlers to be associated.

Releases: master, 10.4
Resolves: #93889
Related: #89813
Change-Id: Ia252fbe1b28d55f0944d5cc51801d01b41b008a5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68754


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>