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

cmake/px4_add_common_flags.cmake

@@ -162,7 +162,7 @@ function(px4_add_common_flags)
 		-Wno-overloaded-virtual # TODO: fix and remove
 	)
 
-	if((NOT CMAKE_BUILD_TYPE STREQUAL FuzzTesting) AND (NOT PX4_CONFIG MATCHES "px4_sitl"))
+	if((NOT BUILD_TESTING) AND (NOT PX4_CONFIG MATCHES "px4_sitl"))
 		list(APPEND cxx_flags
 			-fno-rtti
 		)

cmake/sanitizers.cmake

@@ -131,23 +131,6 @@ elseif (CMAKE_BUILD_TYPE STREQUAL UndefinedBehaviorSanitizer)
 		set_tests_properties(${test_name} PROPERTIES FAIL_REGULAR_EXPRESSION "runtime error:")
 	endfunction(sanitizer_fail_test_on_error)
 
-elseif (CMAKE_BUILD_TYPE STREQUAL FuzzTesting)
-	message(STATUS "FuzzTesting enabled")
-
-	add_compile_options(
-		-g3
-		-fsanitize=fuzzer
-		-DFUZZTESTING
-	)
-
-	set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=fuzzer $ENV{LIB_FUZZING_ENGINE}" CACHE INTERNAL "" FORCE)
-	set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -fsanitize=fuzzer $ENV{LIB_FUZZING_ENGINE}" CACHE INTERNAL "" FORCE)
-	set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -fsanitize=fuzzer $ENV{LIB_FUZZING_ENGINE}" CACHE INTERNAL "" FORCE)
-
-
-	function(sanitizer_fail_test_on_error test_name)
-		# Not sure what to do here
-	endfunction(sanitizer_fail_test_on_error)
 else()
 
 	function(sanitizer_fail_test_on_error test_name)