[TASK] Integrate functional DataHandler tests for FAL

The functional frontend tests are extended with basic FAL
use-cases in the live workspaces, as well as for modifying,
publishing single records and publishing all records in a
particular workspaces scenario.

The frontend is tested by using the TypoScript FILES cObject.

Resolves: #59276
Releases: 6.2
Change-Id: I3a1e59f70015b1168e4f29458c8d6ff77c0b3dcf
Reviewed-on: https://review.typo3.org/30516
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader