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/tests/keytoggle/kt-alt-tab/native_posix_64.keymap

@@ -5,30 +5,30 @@
 &kscan {
 	events = <
     /* Toggle LALT on */
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
     /* Tap TAB twice */
-		ZMK_MOCK_PRESS(0,1,10) 
+		ZMK_MOCK_PRESS(0,1,10)
 		ZMK_MOCK_RELEASE(0,1,10)
-		ZMK_MOCK_PRESS(0,1,10) 
+		ZMK_MOCK_PRESS(0,1,10)
 		ZMK_MOCK_RELEASE(0,1,10)
     /* Toggle LSHFT on */
-		ZMK_MOCK_PRESS(1,0,10) 
+		ZMK_MOCK_PRESS(1,0,10)
 		ZMK_MOCK_RELEASE(1,0,10)
     /* Tap TAB once */
-		ZMK_MOCK_PRESS(0,1,10) 
+		ZMK_MOCK_PRESS(0,1,10)
 		ZMK_MOCK_RELEASE(0,1,10)
     /* Toggle LALT off */
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
     /* Tap A */
-		ZMK_MOCK_PRESS(1,1,10) 
+		ZMK_MOCK_PRESS(1,1,10)
 		ZMK_MOCK_RELEASE(1,1,10)
     /* Toggle LSHFT off */
-		ZMK_MOCK_PRESS(1,0,10) 
+		ZMK_MOCK_PRESS(1,0,10)
 		ZMK_MOCK_RELEASE(1,0,10)
     /* Tap A */
-		ZMK_MOCK_PRESS(1,1,10) 
+		ZMK_MOCK_PRESS(1,1,10)
 		ZMK_MOCK_RELEASE(1,1,10)
 	>;
 };

app/tests/keytoggle/kt-modded-alpha/native_posix_64.keymap

@@ -5,18 +5,18 @@
 &kscan {
 	events = <
     /* Toggle LS(A) on */
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
     /* Toggle LS(A) off */
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
     /* Press A */
-		ZMK_MOCK_PRESS(1,0,10) 
+		ZMK_MOCK_PRESS(1,0,10)
     /* Toggle LS(A) on */
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
     /* Toggle LS(A) off */
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
     /* Release A */
 		ZMK_MOCK_RELEASE(1,0,10)

app/tests/keytoggle/kt-press-release-nkro/native_posix_64.keymap

@@ -2,9 +2,9 @@
 
 &kscan {
 	events = <
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
 	>;
 };

app/tests/keytoggle/kt-press-release/native_posix_64.keymap

@@ -2,9 +2,9 @@
 
 &kscan {
 	events = <
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
-		ZMK_MOCK_PRESS(0,0,10) 
+		ZMK_MOCK_PRESS(0,0,10)
 		ZMK_MOCK_RELEASE(0,0,10)
 	>;
 };