Description of problem:

When multiple github apps installed on multiple controllers, the pac watcher would crash on high concurrency with a nilerror

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

Steps to Reproduce

Run TestGithubPullRequestConcurrency from pac e2e-tests suite and observer the namespace where the test run if pipelinerunpending is there and that the watcher has a go crash in there 

Actual results:

Expected results:

Reproducibility (Always/Intermittent/Only Once):

Acceptance criteria: 

Definition of Done:

Build Details:

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

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