Undo UART looping changes for now (#1367) #831

Job	Run time
tests (ubuntu-latest, tests)	29s
build (ubuntu-latest, noradio)	2m 16s
tests (macos-latest, tests)	34s
build (ubuntu-latest, wifi)	2m 14s
tests (windows-latest, tests_nosan)	1m 30s
build (ubuntu-latest, bt)	2m 6s
build (macos-latest, noradio)	1m 31s
build (macos-latest, wifi)	2m 9s
build (macos-latest, bt)	1m 41s
build (windows-latest, noradio)	4m 53s
build (windows-latest, wifi)	4m 42s
build (windows-latest, bt)	4m 47s
	28m 52s

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