Can no longer order merge requests by merge date.

Steps to reproduce:

1. Build a feature
2. Have two or more merge requests to a develop branch
3. Need to cherry-pick in order of merging to main

What should happen:

1. I go to the MR search
2. I filter by a certain label (Pending cherry-pick to main)
3. I order by merge date
4. I cherry-pick the MRs in the right order

What happens instead

1. I go to the MR search
2. I filter by a label
3. I cannot order by merge date

Extra information

• Bookmarked URL: https://gitlab.{selfhosted.domain}/dashboard/merge_requests/search?author_username=mdemaa&scope=all&sort=merged_at_desc&state=merged
• This was previously possible
• I’m aware of the new “Merged” tab, but this doesn’t allow me to filter by a label