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/jorne/Kconfig.defconfig

@@ -13,7 +13,7 @@ if SHIELD_JORNE_LEFT || SHIELD_JORNE_RIGHT
 
 config ZMK_SPLIT
 	default y
- 
+
 if ZMK_DISPLAY
 
 config I2C