Fix exit code of --help and --version, and test them in CI

Corrects prior regression which caused ERROR output and exit code of 1.

platform/android/java_godot_lib_jni.cpp

@@ -157,6 +157,7 @@ JNIEXPORT void JNICALL Java_org_godotengine_godot_GodotLib_setup(JNIEnv *env, jc
 		memfree(cmdline);
 	}
 
+	// Note: --help and --version return ERR_HELP, but this should be translated to 0 if exit codes are propagated.
 	if (err != OK) {
 		return; // should exit instead and print the error
 	}