VDiff: Add control for start/resume and stop #1062

Job	Run time
Set push variable	1s
Build and push vttestserver (mysql80)	1m 54s
Build and push lite (latest)	2m 2s
Build and push lite (percona80)	2m 14s
Build and push (bullseye, vtadmin)	59s
Build and push (bullseye, vtorc)	44s
Build and push (bullseye, vtgate)	27s
Build and push (bullseye, vttablet)	30s
Build and push (bullseye, mysqlctld)	27s
Build and push (bullseye, mysqlctl)	31s
Build and push (bullseye, vtctl)	1m 22s
Build and push (bullseye, vtctlclient)	26s
Build and push (bullseye, vtctld)	1m 6s
Build and push (bullseye, vtctldclient)	37s
Build and push (bullseye, logrotate)	20s
Build and push (bullseye, logtail)	30s
Build and push (bullseye, vtbackup)	54s
Build and push (bullseye, vtexplain)	23s
Build and push (bookworm, vtadmin)	1m 0s
Build and push (bookworm, vtorc)	27s
Build and push (bookworm, vtgate)	27s
Build and push (bookworm, vttablet)	39s
Build and push (bookworm, mysqlctld)	27s
Build and push (bookworm, mysqlctl)	28s
Build and push (bookworm, vtctl)	29s
Build and push (bookworm, vtctlclient)	37s
Build and push (bookworm, vtctld)	1m 13s
Build and push (bookworm, vtctldclient)	31s
Build and push (bookworm, logrotate)	30s
Build and push (bookworm, logtail)	14s
Build and push (bookworm, vtbackup)	30s
Build and push (bookworm, vtexplain)	29s
	23m 28s

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