(SIMP-9266) Improve GHA GCLI trigger in pupmod-simp-pupmod

[op-ct]

This patch updates the standardized GitHub Actions that trigger GLCI pipelines:

• Still preemptively cancels existing GLCI pipelines for the same branch, EXCEPT when a pipeline is for the same commit hashref.
• Refactored common GLCI logic into new composite run steps actions:
  • github-action-gitlab-ci-pipeline-trigger@v1
  • github-action-gitlab-ci-syntax-check@v1

This patch also enforces the standardized asset baseline using simp/puppetsync, and may apply other updates to ensure conformity.

CI: SKIP MATRIX SIMP-9325 #close SIMP-9266 #comment Standardized GHA + assets in pupmod-simp-pupmod SIMP-9279 #comment .fixtures.yml triggers GLCI acc for pupmod-simp-pupmod