[BUGFIX] Executing Extbase commands as scheduler task

Currently the execution of all Extbase commands as scheduler task
exits with a warning due to wrong parameter input type. This patch
ensures the object is initialized only if needed and a correct CLI
context is available.

Resolves: #73714
Releases: master
Change-Id: I869b1fe9e8440885f4cfb6fb0570ca98334494a1
Reviewed-on: https://review.typo3.org/46928


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>