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/splitreus62/splitreus62_right.overlay

@@ -3,7 +3,7 @@
  *
  * SPDX-License-Identifier: MIT
  */
- 
+
 #include "splitreus62.dtsi"
 
 &default_transform {