Given:
A GroupByDateVariable report has

When:
custom sorting is applied by the user in the reportConfiguration (key, desc) and the report is evaluated

Then:
the report is sorted asc by the key

Expected:
the report should be sorted according to the sorting config

Hint:
This seems to be broken since this commit
https://github.com/camunda/camunda-optimize/commit/82fa22d5a9108e3c77bd3a1de8e4646123b450cf#diff-cad745870a49879271dc88ec9c4555d5R186
where the user config got overriden for this kind of reports

AT:

• behavior is adjusted to expected behavior
• a test verifies custom sorting is working for groupByDateVariable reports (and if also missing also for other groupByVariable types)