Allow rewinding of commands sent via UART buffer #768

Job	Run time
tests (ubuntu-latest, tests)	33s
build (ubuntu-latest, noradio)	1m 50s
tests (macos-latest, tests)	29s
build (ubuntu-latest, wifi)	2m 24s
tests (windows-latest, tests_nosan)	1m 20s
build (ubuntu-latest, bt)	2m 0s
build (macos-latest, noradio)	1m 31s
build (macos-latest, wifi)	1m 48s
build (macos-latest, bt)	2m 10s
build (windows-latest, noradio)	5m 24s
build (windows-latest, wifi)	4m 59s
build (windows-latest, bt)	4m 20s
	28m 48s

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