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/zodiark/Kconfig.defconfig

@@ -8,7 +8,7 @@ config ZMK_KEYBOARD_NAME
 
 config ZMK_SPLIT_ROLE_CENTRAL
 	default y
-	
+
 endif
 
 if SHIELD_ZODIARK_LEFT || SHIELD_ZODIARK_RIGHT

app/boards/shields/zodiark/zodiark.keymap

@@ -39,7 +39,7 @@
 // |       |  0  |  .  | Enter|      |               |       | |       |              |       |   0   |   .  | Enter |       |
             bindings = <
 &trans    &kp F1   &kp F2   &kp F3   &kp F4    &kp F5                                     &kp F6          &kp F7  &kp F8    &kp F9   &kp F10  &kp F11
-&kp KP_NUM &kp KP_N7 &kp KP_N8 &kp KP_N9  &kp PSCRN &kp SLCK &trans                &trans &kp PAUSE_BREAK &trans  &kp KP_N7 &kp KP_N8 &kp KP_N9   &kp F12 
+&kp KP_NUM &kp KP_N7 &kp KP_N8 &kp KP_N9  &kp PSCRN &kp SLCK &trans                &trans &kp PAUSE_BREAK &trans  &kp KP_N7 &kp KP_N8 &kp KP_N9   &kp F12
 &trans     &kp KP_N4 &kp KP_N5 &kp KP_N6  &kp INS   &kp HOME &trans                &trans &kp PG_UP       &trans  &kp KP_N4 &kp KP_N5 &kp KP_N6   &trans
 &trans     &kp KP_N1 &kp KP_N2 &kp KP_N3  &kp DEL   &kp END &trans &trans  &trans  &trans &kp PG_DN       &trans  &kp KP_N1 &kp KP_N2 &kp KP_N3   &trans
 &trans     &kp KP_N0 &kp KP_DOT  &kp KP_ENTER &trans &trans &trans         &trans     &trans              &trans  &kp KP_N0 &kp KP_DOT  &kp KP_ENTER &trans