Hint user to create .bidsignore listing dandiset.yaml #1740
Description
Inspired by
When processing validation errors from bids-validator, seeing the error about dandiset.yaml being not part of BIDS specification, follow it with a HINT level validation result which would suggest to add dandiset.yaml into .bidsignore file. Solution should be accompanied with the unit test so we maintain consistent operation happen generation of validation messages changes for some reason