[!!!][TASK] Remove ext:core AbstractService

AbstractService is not used anymore and is now removed.

Resolves: #96129
Related: #94313
Releases: main
Change-Id: I8a23b80f8d36b446a4ae0bcd1b2d701ec1eade20
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72348


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>