[tooling] use generated GITHUB_TOKEN for authentication

[tbavelier]

What does this PR do?

Attempts to use the automatic generated token for authentication

Motivation

sporadic rate limits https://datadoghq.atlassian.net/browse/CECO-628

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.66%. Comparing base (345912e) to head (7d7a490).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1541   +/-   ##
=======================================
  Coverage   48.66%   48.66%           
=======================================
  Files         226      226           
  Lines       20363    20363           
=======================================
  Hits         9909     9909           
  Misses       9937     9937           
  Partials      517      517           

Flag	Coverage Δ
unittests	48.66% <ø> (ø)

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