[BUGFIX] Fix failing unit tests for HTTP host check in CLI mode

The unit tests for the recent HTTP host fix are failing
if executed in CLI mode.
In CLI mode no server environments and HTTP headers are available,
that's why the behavior needs to know about the
test execution process.

We solve this by mocking allowed request types.

Resolves: #59022
Releases: 6.2, 6.1, 6.0
Change-Id: I3c93d181dcec5f34064798e7c31240877fde610d
Reviewed-on: https://review.typo3.org/30323
Reviewed-by: Nicole Cordes
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel