update gitlab jobs for nightly deploy

[celenechang]

What does this PR do?

Update nightly Gitlab jobs to trigger from Conductor and to trigger a child deployment pipeline

Motivation

What inspired you to submit this pull request?

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 55.20%. Comparing base (fe0485d) to head (f0edeb9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1300   +/-   ##
=======================================
  Coverage   55.20%   55.20%           
=======================================
  Files         247      247           
  Lines       28383    28383           
=======================================
  Hits        15670    15670           
  Misses      11827    11827           
  Partials      886      886           

Flag	Coverage Δ
unittests	55.20% <ø> (ø)

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