[BUGFIX] Fix serialization of ObjectManager

The PSR-11 container instance was not cleared upon serialization which
caused an exception when Closures in the container where tried to be
serialized.

__wakeup() does already contain code to reset the container instance,
therefore we only need to clear the entire object manager properties
in __sleep().

Releases: master
Resolves: #91398
Related: #88689
Change-Id: I58202752577b58cd882d13f471af1e045c9a4187
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64489


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>