ci_status endlessly polled

Summary

ci_status is endlessly polled.

Steps to reproduce

Open web inspector's network tab.

Expected behavior

Polling to be less frequent or stop when a pipeline ends (fails, succeeds).

Actual behavior

See screenshot, notice that a MR json object is also frequently fetched.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

/cc @ayufan