kubernetes: jitter transient dial retries - #4039
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closes #3995
Kubernetes dial retries now add jitter to the exponential backoff used for transient connection errors. This keeps concurrent builders from retrying in lockstep when node readiness gets ahead of CSR approval and many builds hit the same temporary TLS failure at once.
The jitter is additive, so retries never happen sooner than the existing exponential schedule would allow, and the delay remains capped by the configured maximum.