[TASK] Remove unused functions in FormEngineUtility

The functions getLanguageService() and getDatabaseConnection() in
FormEngineUtility are not used and can be removed.

Resolves: #76357
Releases: master
Change-Id: I2883152c7ec3f40f80c280f360488a06b0ef9ba8
Reviewed-on: https://review.typo3.org/48369


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>