Revert "Bug 1991117 - Add option to copy a message tailored for backouts"

[beatrice-acasandrei]

Reverts #9034

[codecov-commenter]

Codecov Report

❌ Patch coverage is 4.16667% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.23%. Comparing base (aa690aa) to head (d35403e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
ui/perfherder/alerts/StatusDropdown.jsx	4.34%	22 Missing ⚠️
ui/perfherder/alerts/AlertsViewControls.jsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #9061       +/-   ##
===========================================
+ Coverage   51.04%   80.23%   +29.19%     
===========================================
  Files         591      595        +4     
  Lines       31821    31940      +119     
  Branches     3279     3278        -1     
===========================================
+ Hits        16242    25628     +9386     
+ Misses      15411     6144     -9267     
  Partials      168      168               

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