Update lint workflows to only lint changed files

[dawsonbooth]

To shorten the workflow duration, we should reduce the files to lint to only those that are changed in a PR.

Helpful links:

• https://gist.github.com/seeliang/0f0de424d1cdc4541c338f4ee93b7e6a
• https://dev.to/flipp-engineering/linting-only-changed-files-with-github-actions-4ddp
• https://github.com/tj-actions/changed-files