[TASK] Enable DataHandler frontend rendering tests

After having performed changes to data structures using the
DataHandler, the correct impact for the frontend needs to be
asserted. This patch checks the correct behavior for DataHandler
action tests for regular, MM and IRRE disposal.

Resolves: #56104
Releases: 6.2
Change-Id: I99f11f6b039c31e08614caf8ee9bca9d47700b93
Reviewed-on: https://review.typo3.org/27711
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader