[TASK] Use DI in TranslationConfigurationProvider

* Use runtimeCache instead of a class cache property
* Declare readonly
* DI dependent services
* Declare some safe to set types
* Adapt tests
* Fix a broken test in BackendUtilityTest that used
  backendUser and global language object before
  site configuration has been written

Resolves: #105257
Releases: main
Change-Id: I80aaca4ed0d71656fc01fa4676868c50e7d70d35
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86537


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