EKF2: do not pre-compute airspeed Kalman gain #27245

Job	Run time
build (check_format)	1m 9s
build (check_newlines)	1m 30s
build (tests)	6m 0s
build (tests_coverage)	7m 27s
build (px4_fmu-v2_default stack_check)	3m 16s
build (validate_module_configs)	53s
build (shellcheck_all)	1m 32s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 23s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 26s
build (px4_sitl_allyes)	4m 32s
build (module_documentation)	1m 0s
	35m 8s

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