Merged requested to merge fix/ci-config-hidden-key-validation into master
What does this MR do?
This MR remove the validation rule that was to strict.
Why was this MR needed?
Enforcing hidden CI job configuration to be a hash, narrows options of using YAML anchors, and was not backwards compatbile.
Does this MR meet the acceptance criteria?
CHANGELOG entry added
Added for this feature/bug
All builds are passing
Conform by the style guides
Branch has no merge conflicts with
master(if you do - rebase it please)
Squashed related commits together
What are the relevant issue numbers?
Closes #21512 (closed)