[BUGFIX] Unit tests call parent::tearDown()

For the memory garbage collection of UnitTestCase to kick in,
it is important that unit tests which implement tearDown()
call parent after their own job.

Fix some missing parent calls, refactor some other tests
slightly to live without tearDown() and activate two tests
that come with an invalid @depends annotation.

Change-Id: I51c7534ea3220ec63fd8c3efa94e8bf295590e68
Resolves: #83944
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/55761


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>