[TASK] Add possibility to assert error log entries

[TASK] Add possibility to assert error log entries

During the action tests it might happen, that errors occur.
To assert expected or unexpected error log entries in the
sys_log table, this functionality shall be added to the
functional testing framework.

Resolves: #56369
Releases: 6.2
Change-Id: I07806e69cb7f575c844a3adf442233a82fa01505
Reviewed-on: https://review.typo3.org/27886
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader