gha-runner-scale-set: add a PodDisruptionBudget !

[awoimbee]

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Imagine this scenario:

• A runner is launched
• Someone delete the karpenter.sh/v1/nodeclaim on which the runner is 😱
• CI job fails

With a simple PodDisruptionBudget, the runner would not be killed, karpenter would wait for the end of the job.

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