[TASK] Allow rector to process tests

In order to let rector process tests, the autoloading
of all processed classes needs to be intact.

In TYPO3 there were a bunch of classes whose namespace
were a bit wrong according to PSR-4 and there were some
class that didn't fit the PSR-4 standard at all.

Classes that could easily be fixed have been fixed.
All others have either been registered via a class map
in composer.json or they have been excluded from the
processing of rector.

This change does not apply rector rules to tests,
it only enables rector to operate on tests due to
fixed autoloading.

Releases: master
Resolves: #89900
Change-Id: Iaa4a5bb2677a5a9af374d780423d962dcc09ade2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62583


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>