[TASK] Use CLI and Composer Checks via Environment class

Use Environment::isCli() instead of constant munging
in various places. Usages in extbase are left out for
the time being since those give headaches with functional
frontend tests at the moment. Those will be sorted out
with further patches.

Resolves: #85271
Releases: master
Change-Id: I7391bb393eec69bf04fab0e6d31c8a579dc79493
Reviewed-on: https://review.typo3.org/57227


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>