Add a link to Bugzilla in the MWU warning banner.

[gmierz]

This patch adds a link to the MWU warning banner to make it easier for developers to file issues or suggestions for improvements.

[netlify]

✅ Deploy Preview for mozilla-perfcompare ready!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.18%. Comparing base (b4a9109) to head (a42cd0a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #981   +/-   ##
=======================================
  Coverage   96.18%   96.18%           
=======================================
  Files         104      104           
  Lines        3014     3016    +2     
  Branches      686      686           
=======================================
+ Hits         2899     2901    +2     
  Misses        114      114           
  Partials        1        1           

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[gmierz]

Here's a link that can be used to check the changes: https://deploy-preview-981--mozilla-perfcompare.netlify.app/compare-lando-results?baseLando=166878&newLando=166879&baseRepo=try&newRepo=try&framework=15&replicates=&test_version=mann-whitney-u&filter_status=improvement%2Cregression