What does this MR do?
Adds support to specify and override the kubernetes system account of the kubernetes executor pod
Why was this MR needed?
In a cluster with RBAC installed, if the namespace is overwritten via
KUBERNETES_NAMESPACE_OVERWRITE the job will fail because the SA of the runner won't be available on the target namespace.
Are there points in the code the reviewer needs to double check?
Does this MR meet the acceptance criteria?
Added for this feature/bug
All builds are passing
Branch has no merge conflicts with
master(if you do - rebase it please)