[TASK] New TS parser in Extbase BackendConfigurationManager

Switch the Extbase BackendConfigurationManager to
use the new TypoScript parser. The implementation
is quicker for Extbase Backend modules.

Change-Id: Icb821fbe8804f219806abc5094ace3d404b96a73
Resolves: #99017
Related: #97816
Releases: main
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76447


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