[TASK] Do not use Extbase for querying sys_log

The only reason why there is TCA
for sys_log is that EXT:belog can use Extbase
to query records.

The change now uses a custom Repository
without Extbase while keeping the model
architecture, effectively allowing us
to remove the TCA entry for sys_log.

Resolves: #102930
Releases: main
Change-Id: I921124e731a63969825405f8d5e04bb4912ec498
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82644


Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>