Prevent runner controller from recreating runner pod when terminated externally #1851
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While I was running E2E tests, I discovered an issue which resulted in some (unexpectedly recreated) runners grabbing jobs from GitHub Actions and being killed prematurely by ARC, when the pod was deleted directly, not via the parent runner resource.
You don't usually delete runner pods directly. Neither deletion of RunnerDeployment, Runner, nor RunnetSet triggers this scenario. However, this change should be useful when the pods can get deleted externally, for example, as a part of cluster-autoscaler's node termination process.
This was tested locally in my local branch that contains both this and #1759.