Code Review Analytics: not filters are not working

Summary

On the code review analytics page not filters are not working. I believe it happened after not filters were introduced on the search field and perhaps the corresponding UI logic did not get updated?

Steps to reproduce

1. On the code review analytics page, filter MRs based on a label
2. Verify that on the same page when you filter MRs based on a label with != filtering does not work and all active MRs are displayed

What is the current bug behavior?

Filtering on negative labels or milestones is not working. Basically, not filters are not working

What is the expected correct behavior?

Filtering should work as on the MR page.

Relevant logs and/or screenshots

Output of checks

(If you are reporting a bug on GitLab.com, write: This bug happens on GitLab.com)

Possible fixes

Have not looked into the code yet, will update if I can later.