Optimize Clang-Tidy using Git Diff

[Elan456]

• We can just git diff to see which files have changed and only run Clang-Tidy on those files to speed up run times for pre-commit hooks.
• It's a bit tricky though b/c some of the files are within the Avionics sub-repo which are harder to see with git diff
• Not sure what the best solution is. Ideally we have it so that when you commit within Avionics it uses what ever repo it's within to test it self. Like a cd ../../ && pio check