[TASK] Remove unused ext:core AbstractCondition

Core Configuration\TypoScript\ConditionMatching\AbstractCondition
is an old TypoScript condition leftover, unused and can be
removed without further notice:

It has been added in with #61489 in v7 - own condition classes
for TypoScript, superseded with #85829 in v9 - symfony
expressions for TypoScript conditions, old syntax has
been deprecated in v9 with #86068 and removed in v10
with #87607.

Change-Id: I5283a06650d5bfa975685a4f91cb918d7653f460
Resolves: #94387
Related: #61489
Related: #63600
Related: #85829
Related: #86068
Related: #87607
Releases: master
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69533


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>