build: Ignore generated Android files (#55569)

These assets are generated at build time for E2E testing. Seemingly, we
do not leverage these generated files for the binary/bundle that we
provide to the host apps. Therefore, we can safely ignore these files.

packages/react-native-editor/.gitignore

@@ -28,6 +28,11 @@ bundle/
 .gradle/
 android/app/src/main/assets/
 android/app/src/main/res/raw/
+android/app/src/main/res/drawable-hdpi/
+android/app/src/main/res/drawable-mdpi/
+android/app/src/main/res/drawable-xhdpi/
+android/app/src/main/res/drawable-xxhdpi/
+android/app/src/main/res/drawable-xxxhdpi/
 
 # iOS builds
 *.app.zip