Description of problem:

While doing Merge PullRequest, PAC not able to trigger PipelineRun for event push with `on-path-change` on Bitbucket-Server/DataCenter. In logs it does say Push event but cannot find matching PipelineRun.

This issue was originally fixed by https://github.com/openshift-pipelines/pipelines-as-code/pull/2145 in SRVKP-7432, but the fix introduced a deeper semantic bug which required that fix be reverted.

Prerequisites (if any, like setup, operators/versions): OSP 1.18

Steps to Reproduce

 - Setup Bitbucket Server/DataCenter with PAC

• Configure two pipelineRun with on-path-change and with same directories
• First PipelineRun will have target branch as xyz and Second have target branch as main/master
• Make changes to xyz and create a pull request with main/master branch.
• This will trigger first PipelineRun.
• Merge Pull Request to Main/master branch.

slack thread: https://redhat-internal.slack.com/archives/CSPS1077U/p1743998168167349

Actual results: push event PipelineRun doesn't get trigger with logs 

**

"msg":"cannot match the event to any pipelineruns in the .tekton/ directory, payload target event is push with source branch refs/heads/master and target branch refs/heads/master. 

Expected results: Trigger second PipelineRun

Reproducibility (Always/Intermittent/Only Once): Always

Acceptance criteria: 

Definition of Done:

Build Details:

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

Please note this did work until adding the annotations for pipelinesascode.tekton.dev/on-path-change: 

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