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?
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CHANGELOG entry added -
Documentation created/updated - Tests
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Added for this feature/bug -
All builds are passing
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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)