[BUGFIX] Fix failing tests in ActionControllerTest

Introduction of signals into ActionController caused
some Unit Tests to fail. This patch injects the missing
SignalSlotDispatcher into those tests.

Fixes: #44334
Releases: 6.1
Change-Id: I44cfa71070442a83e2259d57743353dcaba0f3e7
Reviewed-on: https://review.typo3.org/17383
Reviewed-by: Alexander Schnitzler
Tested-by: Alexander Schnitzler
[BUGFIX] Suppress debug output of debugger in unit tests

Currently the debug output will be rendered which
leads to printed css if testing unit tests on the
command line.

Releases: 6.0
Fixes: #44335
Change-Id: Ie25c8f6cfe7380739d34a270ea2a0b3984e168e2
Reviewed-on: https://review.typo3.org/17388
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring