Resolve "Add yamllint to `make lint`"
9524-add-shellcheck-linter
What does this MR do?
Adds support for yamllint to lint all our YAML files.
Why was this MR needed?
Often we have issues with indentation misalignment in our CI yaml files. This linter will warn us about inconsistencies, among other issues.
What's the best way to test this MR?
Check a failing pipeline.
What are the relevant issue numbers?
Closes #26478
Edited by Arran Walker