Add autotest for Solo mount #38259

Job	Run time
build (base)	5m 34s
build-gcc-heli	8m 53s
build (clang)	5m 37s
autotest (sitltest-copter-tests1a)	12m 38s
autotest (sitltest-copter-tests1b)	10m 28s
autotest (sitltest-copter-tests1c)	12m 44s
autotest (sitltest-copter-tests1d)	9m 19s
autotest (sitltest-copter-tests1e)	9m 33s
autotest (sitltest-copter-tests2a)	10m 22s
autotest (sitltest-copter-tests2b)	29m 26s
autotest-heli (sitltest-heli)	10m 56s
	2h 5m 30s

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