ci: check linting and validate that convert.py was run

[tazlin]

This is to facilitate new contributors to this repo as @henk717 will be stepping away from regularly maintaining the models list. @candre23 will be the primary beneficiary of this change but there is a potential that others may end up stepping in.

To simplify this, the changes in this PR will cause github workflows to run which check:

• That whitespace formatting is correct (file line endings, no extra whitespace, etc)
• That *.csv and *.json files are well-formed
• That running convert.py would result in the exact db.json file that is currently in the repo
  • For PRs, this checks that the incoming models.csv matches the incoming db.json.