[BUGFIX] Avoid PHP notices in unit tests

When commenting out the line

  SystemEnvironmentBuilder::initializeBasicErrorReporting()

then Unit Tests run with notices, showing notices as errors.

This happened due to recent updates of the TYPO3 testing framework v6.

The fix to overcome this is https://review.typo3.org/c/Packages/TYPO3.CMS/+/62926
but the preferred clean ups are done beforehand.

Resolves: #90245
Releases: master
Change-Id: Ieb43f2f9524fb18c221b9c690de7116c994f5260
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63068


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>