Allow specifying the stage reliost symbol server

[mstange]

Main | Deploy preview

Add stage.reliost.nonprod.webservices.mozgcp.net to the list of hosts that are accepted in the ?symbolServer= arg

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.65%. Comparing base (342d130) to head (7b78c9b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6228   +/-   ##
=======================================
  Coverage   83.65%   83.65%           
=======================================
  Files         348      348           
  Lines       37339    37339           
  Branches    10376    10376           
=======================================
  Hits        31237    31237           
  Misses       5674     5674           
  Partials      428      428           

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