Improve efficiency of `vtorc` topo calls (#17071) #409

Job	Run time
Build and push vttestserver (mysql80)	2m 27s
Build and push lite (latest)	4m 21s
Build and push lite (percona80)	4m 28s
Build and push (bullseye, vtadmin)	1m 21s
Build and push (bullseye, vtorc)	1m 3s
Build and push (bullseye, vtgate)	56s
Build and push (bullseye, vttablet)	48s
Build and push (bullseye, mysqlctld)	47s
Build and push (bullseye, mysqlctl)	50s
Build and push (bullseye, vtctl)	47s
Build and push (bullseye, vtctlclient)	45s
Build and push (bullseye, vtctld)	1m 38s
Build and push (bullseye, vtctldclient)	53s
Build and push (bullseye, logrotate)	20s
Build and push (bullseye, logtail)	35s
Build and push (bullseye, vtbackup)	52s
Build and push (bullseye, vtexplain)	52s
Build and push (bookworm, vtadmin)	1m 25s
Build and push (bookworm, vtorc)	46s
Build and push (bookworm, vtgate)	41s
Build and push (bookworm, vttablet)	59s
Build and push (bookworm, mysqlctld)	43s
Build and push (bookworm, mysqlctl)	41s
Build and push (bookworm, vtctl)	49s
Build and push (bookworm, vtctlclient)	48s
Build and push (bookworm, vtctld)	1m 27s
Build and push (bookworm, vtctldclient)	36s
Build and push (bookworm, logrotate)	36s
Build and push (bookworm, logtail)	31s
Build and push (bookworm, vtbackup)	42s
Build and push (bookworm, vtexplain)	47s
Slack Notification if failed	0s
	35m 14s

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