[BUGFIX] Rename directory for deprecated unit tests

The directory name for deprecated unit tests are named "Unit_Deprecated" for EXT:core and EXT:form,
which is wrong, the tests don't get executed. This patch fixes the names
to "UnitDeprecated".

Resolves: #83525
Releases: master
Change-Id: I2f6f3a70ae4514e58bc885416821cf2aa3340297
Reviewed-on: https://review.typo3.org/55317


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>