refactor(consensus): handle proposal part in select branch ensuring cancellation safety #8331

Job	Run time
executable-run	12m 54s
executable-run-no-rpc	11m 33s
build-papyrus-utilities-image	24s
integration-test	17m 59s
random-table-test	2m 0s
test-no-rpc	6m 16s
	51m 6s

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