Use more specific self-hosted runner name

[opentelemetrybot]

This will prevent other self-hosted runners from accidentally getting used when we bring them online. See open-telemetry/community#2801 for details.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.77%. Comparing base (f2f29f5) to head (5ee945e).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7399   +/-   ##
=========================================
  Coverage     89.77%   89.77%           
  Complexity     6982     6982           
=========================================
  Files           797      797           
  Lines         21160    21160           
  Branches       2056     2056           
=========================================
  Hits          18996    18996           
  Misses         1503     1503           
  Partials        661      661           

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