Disable pipeline triggering on commits without MR.

Urvang Joshirequested to merge
urvang/avm:ci_disable_commit_pipeline into main

This avoids two types of duplicate(ish) pipelines: (a) Pipeline triggered on fork due to a commit made with git push (b) Pipeline triggered on main repo after an MR is merged (as that creates a commit too).

For issue #3 (closed)

Edited by Urvang Joshi

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