Description of problem:

https://pipelinesascode.com/docs/guide/running/#cancelling

The cancel-in-progrees feature introduced with PAC 0.30.0 is not properly working on Gitlab pull request.

Steps to Reproduce

• Apply the following annotation to a tekton PipelineRun:apiVersion: tekton.dev/v1
  kind: PipelineRun
  metadata:
  annotations:
  build.appstudio.openshift.io/repo: https://gitlab.cee.redhat.com/aap-konflux/config/ansible-automation-platform-operator-bundle-container/-/tree/\{\{revision}}
  build.appstudio.redhat.com/commit_sha: "revision"
  build.appstudio.redhat.com/pull_request_number: "pull_request_number"
  build.appstudio.redhat.com/target_branch: "target_branch"
  pipelinesascode.tekton.dev/cancel-in-progress: "true"

• Open a pull request and push two commits

  Actual results:

There are concurrent tekton pipelines running for the same pull request.

Expected results:

The expected result is that all the previous tekton pipelines should be canceled and only the last one should be up and running.

Reproducibility (Always):

Apply to PipelineRuns the following annotation:

 
apiVersion: tekton.dev/v1
kind: PipelineRun
metadata:
annotations:
build.appstudio.openshift.io/repo: https://gitlab.cee.redhat.com/aap-konflux/config/ansible-automation-platform-operator-bundle-container/-/tree/\{\{revision}}
build.appstudio.redhat.com/commit_sha: "revision"
build.appstudio.redhat.com/pull_request_number: "pull_request_number"
build.appstudio.redhat.com/target_branch: "target_branch"
pipelinesascode.tekton.dev/cancel-in-progress: "true"

And trigger more than one PR.

Acceptance criteria: 

• The old pipelines must be canceled properly
• Only one running PR per pull request

Build Details: See slack thread

Additional info (Such as Logs, Screenshots, etc):

Slack thread: https://redhat-internal.slack.com/archives/C02CTEB3MMF/p1739439605456799

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