Add filtered search to MR page

What does this MR do?

Adds the filtered search to the MR page

Are there points in the code the reviewer needs to double check?

Everything

Why was this MR needed?

Deliverable

Screenshots (if relevant)

Before	After

Does this MR meet the acceptance criteria?

Yes

What are the relevant issue numbers?

Closes #27131 (closed)

What is the corresponding EE MR?

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1243