Bug 1864376 - Perform glean-probe-scraper workflow only on master/main branch.

[arai-a]

for https://bugzilla.mozilla.org/show_bug.cgi?id=1864376

I've included both master and main, to make sure this workflow keeps working even if the branch is renamed in future.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cf69e68) 76.83% compared to head (9de1dfd) 76.83%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7874   +/-   ##
=======================================
  Coverage   76.83%   76.83%           
=======================================
  Files         538      538           
  Lines       26621    26621           
  Branches     3360     3360           
=======================================
  Hits        20455    20455           
  Misses       6001     6001           
  Partials      165      165           

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