Add pod annotations for kubernetes executor

Closed username-removed-502819 requested to merge 45cali/gitlab-ci-multi-runner:master into master

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What does this MR do?

Adds the ability to add annotations to the pods that the runner creates for the kubernetes executor

Why was this MR needed?

To be able to use kube2iam annotations need to be set for the pod.

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

Edited by Tomasz Maczukin