tests: remove previous fuzz testing

We now use https://github.com/google/fuzztest (see previous commits).
And the test was also failing to build
(https://github.com/PX4/PX4-Autopilot/actions/workflows/cflite_batch.yml)

This reverts these commits:
- 9eda5b373c
- 2cbc993976
- be0a5b4b32

Makefile

@@ -160,11 +160,6 @@ else
 		override CMAKE_ARGS += -DCMAKE_BUILD_TYPE=UndefinedBehaviorSanitizer
 	endif
 
-	# Fuzz Testing
-	ifdef PX4_FUZZ
-		override CMAKE_ARGS += -DCMAKE_BUILD_TYPE=FuzzTesting
-	endif
-
 endif
 
 # Pick up specific Python path if set