chore(workflow): rename GH_INSTANCE_* to JEST_WORKER_*

[canonbrother]

What this PR does / why we need it:

Which issue(s) does this PR fixes?:

as per title

Additional comments?:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.46%. Comparing base (767aa71) to head (182b7e0).

❗ Current head 182b7e0 differs from pull request most recent head a2ab819. Consider uploading reports for the commit a2ab819 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2184      +/-   ##
==========================================
+ Coverage   89.38%   89.46%   +0.07%     
==========================================
  Files         374      374              
  Lines       11319    11319              
  Branches     1486     1486              
==========================================
+ Hits        10118    10126       +8     
+ Misses       1144     1139       -5     
+ Partials       57       54       -3     

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