Description of problem:

The PaC controller fetches the list of changed files once for every PipelineRun definition under the .tekton directory. Given that the list of changed files is a static attribute for an event, this is unnecessary.

On a repository with ~400 PipelineRuns, this takes about 2 minutes to process, and often causes rate-limiting from GitHub. If I remove the path changed labels from my PipelineRuns, this happens within a few seconds.

(The code seems to suggest that this is also the behavior when using cel expressions that check for changed paths.)

NOTE: If both pipelinesascode.tekton.dev/on-path-change and pipelinesascode.tekton.dev/on-path-change-ignore are used, the files are fetched twice for each PipelineRun.

The problem appears to be in annotation_matcher.go which implies it affects all providers, not just GitHub.

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