checks: pre-commit: add yaml file lint #2790
Merged
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This adds yaml linter https://github.com/adrienverge/yamllint
and formatter https://github.com/jumanjihouse/pre-commit-hook-yamlfmtto.pre-commit-config.yaml
.All .yml files have also been fixed to pass without warning and formatted (for unified standard).
With CI's super-linter testing for yaml files, it is preferable to pre-empt any failures.