tests/emulator, .github/workflows/emulator: add #43

Job	Run time
emulate (29, bootstrap_flakes)	13m 15s
emulate (29, bootstrap_channels)	8m 13s
emulate (29, poke_around)	7m 54s
emulate (29, test_channels_uiautomator)	13m 23s
emulate (29, test_channels_shell)	15m 56s
emulate (34, bootstrap_flakes)	4m 44s
emulate (34, bootstrap_channels)	5m 24s
emulate (34, poke_around)	5m 34s
emulate (34, test_channels_uiautomator)	5m 26s
emulate (34, test_channels_shell)	4m 51s
	1h 24m 40s

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