refactor: Add more checks to pre-commit

Updated existing pre-commit hooks and added some new hooks:

- Remove trailing whitespace
- Ensure every non-empty file ends with a new line
- Check YAML file validity
- Prevent adding large files
- Ensure any scripts with shebangs are executable

Added a GitHub action to run pre-commit on every commit. Removed any
existing actions which duplicate pre-commit.

Ran pre-commit on the codebase.

app/boards/shields/helix/helix.dtsi

@@ -42,6 +42,6 @@ RC(4,0) RC(4,1) RC(4,2) RC(4,3) RC(4,4) RC(4,5) RC(4,6)   RC(4,7) RC(4,8) RC(4,9
             , <&pro_micro 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
             , <&pro_micro 8 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
             ;
-        
+
     };
 };