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 95.00%. Comparing base (86bab66) to head (a795e51).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5747   +/-   ##
=======================================
  Coverage   95.00%   95.00%           
=======================================
  Files         303      303           
  Lines        7952     7952           
  Branches     1609     1609           
=======================================
  Hits         7555     7555           
  Misses        397      397           

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