[CI] Intermittent failure: "Agent connection not found. Is agent up to date and connected?"

Summary

Example failure: https://gitlab.com/gitlab-org/charts/gitlab/-/jobs/3906636917

Error from server: GitLab Agent Server: HTTP->gRPC: failed to read gRPC response: rpc error: code = DeadlineExceeded desc = Agent connection not found. Is agent up to date and connected?. Trace ID: 95f6e0872003b23d29eb4c2c1861e084

So far, this is fixed with 1-2 retries.