Wait for k8s pod to become attachable as part of poll period in exec mode

Romuald Atchadé - OOO until Jan 11th, 2026requested to merge
k8s-wait-for-pod-to-be-ready into main

What does this MR do?

This MR is a follow-up of !3556 (merged). It makes GitLab Runner waits for Pod to be actually ready before starting the job stages.

Why was this MR needed?

Add support for exec mode

What's the best way to test this MR?

What are the relevant issue numbers?

close #37244 (closed)

Edited by Romuald Atchadé - OOO until Jan 11th, 2026

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