Added some test gcode to fixtures #848

Job	Run time
tests (ubuntu-latest, tests)	29s
build (ubuntu-latest, noradio)	2m 9s
tests (macos-latest, tests)	35s
build (ubuntu-latest, wifi)	2m 17s
tests (windows-latest, tests_nosan)	1m 18s
build (ubuntu-latest, bt)	2m 13s
build (macos-latest, noradio)	1m 29s
build (macos-latest, wifi)	1m 59s
build (macos-latest, bt)	2m 9s
build (windows-latest, noradio)	5m 11s
build (windows-latest, wifi)	4m 42s
build (windows-latest, bt)	5m 30s
	30m 1s

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