VReplication: Estimate lag when workflow fully throttled #559

Job	Run time
Set push variable	1s
Build and push vttestserver (mysql80)	1m 57s
Build and push lite (latest)	2m 32s
Build and push lite (percona80)	2m 9s
Build and push (bullseye, vtadmin)	1m 16s
Build and push (bullseye, vtorc)	24s
Build and push (bullseye, vtgate)	42s
Build and push (bullseye, vttablet)	42s
Build and push (bullseye, mysqlctld)	37s
Build and push (bullseye, mysqlctl)	31s
Build and push (bullseye, vtctl)	36s
Build and push (bullseye, vtctlclient)	33s
Build and push (bullseye, vtctld)	1m 15s
Build and push (bullseye, vtctldclient)	40s
Build and push (bullseye, logrotate)	12s
Build and push (bullseye, logtail)	23s
Build and push (bullseye, vtbackup)	44s
Build and push (bullseye, vtexplain)	38s
Build and push (bookworm, vtadmin)	1m 7s
Build and push (bookworm, vtorc)	27s
Build and push (bookworm, vtgate)	38s
Build and push (bookworm, vttablet)	28s
Build and push (bookworm, mysqlctld)	39s
Build and push (bookworm, mysqlctl)	40s
Build and push (bookworm, vtctl)	42s
Build and push (bookworm, vtctlclient)	53s
Build and push (bookworm, vtctld)	1m 20s
Build and push (bookworm, vtctldclient)	46s
Build and push (bookworm, logrotate)	16s
Build and push (bookworm, logtail)	27s
Build and push (bookworm, vtbackup)	30s
Build and push (bookworm, vtexplain)	30s
	25m 15s

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