[gitlab] small fixes for gitlab job rules

[celenechang]

What does this PR do?

• Don't run test or e2e stages when triggered by Conductor
• Don't publish main image when triggered by Conductor
• Set automatic rollout on Conductor trigger of child k8s-datadog-agent-ops pipeline

Motivation

Trim time spent running Conductor job
Don't use e2e tests which currently error
Automatically start workload publishing without manual intervention

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 47.56%. Comparing base (12a4dd7) to head (fdf6332).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1328      +/-   ##
==========================================
+ Coverage   47.36%   47.56%   +0.20%     
==========================================
  Files         230      230              
  Lines       22027    22085      +58     
==========================================
+ Hits        10432    10504      +72     
+ Misses      11005    10989      -16     
- Partials      590      592       +2     

Flag	Coverage Δ
unittests	47.56% <ø> (+0.20%)	⬆️

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see 1 file with indirect coverage changes

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