[TASK] Allow xdebug with PHP8.2 in Build/Scripts/runTests.sh

xdebug does not have an official compatible version which can
be used with PHP8.2, and thus xdebug had been missing in the
PHP8.2 alpha1 image. To avoid using xdebug with PHP8.2 this
had been guarded with a corresponding check in `runTests.sh`.

`typo3/core-testing-php82` docker image has since been rebuilt
with PHP8.2 alpha2 and using a fork of xdebug, which compiles
the extension against PHP8.2.

The check in `runTests.sh` is now removed again in order to
allow early xdebug-ging using `Build/Scripts/runTests.sh`.

Resolves: #97811
Releases: main, 11.5
Change-Id: Ie9b6795873f38e0a8ea98cfabe4acf7de9ef2056
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74944


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>