Run format check in CI

[lukekarrys]

This PR adds a format:check script to the root an runs it as part of the lint CI job.

A few other related changes:

• The prettier scripts in package.json now target all files and rely on .prettierignore to ignore file types that should not be formatted. This works a little better with some tooling like VSCode plugins.
• Runs both lint and format:check regardless of if one fails or not
• Runs prettier --write . with these changes to catch some unformatted source code that has snuck in

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Latest commit: 54ea8b5

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