Merge wpiformat configs (#8365)

After replacing the remaining include guards with `#pragma once`, I was
able to merge all the wpiformat configs into one file in the repo root.
This should make the config easier to reason about and maintain in the
future.

hal/src/main/native/cpp/jni/HALUtil.h

@@ -2,8 +2,7 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#ifndef HAL_HAL_SRC_MAIN_NATIVE_CPP_JNI_HALUTIL_H_
-#define HAL_HAL_SRC_MAIN_NATIVE_CPP_JNI_HALUTIL_H_
+#pragma once
 
 #include <jni.h>
 #include <stdint.h>
@@ -85,5 +84,3 @@ jobject CreateCANStreamMessage(JNIEnv* env);
 JavaVM* GetJVM();
 
 }  // namespace wpi::hal
-
-#endif  // HAL_HAL_SRC_MAIN_NATIVE_CPP_JNI_HALUTIL_H_