Add hysteresis to max height above ground failsafe logic #27321

Job	Run time
build (check_format)	1m 7s
build (check_newlines)	1m 29s
build (tests)	5m 0s
build (tests_coverage)	4m 7s
build (px4_fmu-v2_default stack_check)	3m 16s
build (validate_module_configs)	50s
build (shellcheck_all)	1m 31s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 13s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 22s
build (px4_sitl_allyes)	4m 21s
build (module_documentation)	56s
	30m 12s

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