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/splitkb_aurora_lily58/Kconfig.defconfig

@@ -21,7 +21,7 @@ config ZMK_RGB_UNDERGLOW
 	select SPI
 
 config ZMK_DISPLAY
-	
+
 if ZMK_DISPLAY
 
 config SSD1306

app/boards/shields/splitkb_aurora_lily58/splitkb_aurora_lily58_left.overlay

@@ -25,7 +25,7 @@
 			, <&pro_micro 8  GPIO_ACTIVE_HIGH>
 			;
 
-		col-gpios 
+		col-gpios
 			= <&pro_micro 9  (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>
 			, <&pro_micro 18 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>
 			, <&pro_micro 15 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>

app/boards/shields/splitkb_aurora_lily58/splitkb_aurora_lily58_right.overlay

@@ -25,7 +25,7 @@
 			, <&pro_micro 10 GPIO_ACTIVE_HIGH>
 			;
 
-		col-gpios 
+		col-gpios
 			= <&pro_micro 9  (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>
 			, <&pro_micro 8  (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>
 			, <&pro_micro 7  (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>