refac: Refactor `Server.GetWorkflows()` (#17092) #481

Job	Run time
Build and push lite (latest)	4m 58s
Build and push vttestserver (mysql80)	2m 47s
Build and push lite (percona80)	4m 35s
Build and push (bullseye, vtadmin)	1m 21s
Build and push (bullseye, vtorc)	50s
Build and push (bullseye, vtgate)	51s
Build and push (bullseye, vttablet)	49s
Build and push (bullseye, mysqlctld)	46s
Build and push (bullseye, mysqlctl)	50s
Build and push (bullseye, vtctl)	37s
Build and push (bullseye, vtctlclient)	43s
Build and push (bullseye, vtctld)	1m 39s
Build and push (bullseye, vtctldclient)	42s
Build and push (bullseye, logrotate)	27s
Build and push (bullseye, logtail)	23s
Build and push (bullseye, vtbackup)	46s
Build and push (bullseye, vtexplain)	52s
Build and push (bookworm, vtadmin)	1m 29s
Build and push (bookworm, vtorc)	55s
Build and push (bookworm, vtgate)	55s
Build and push (bookworm, vttablet)	50s
Build and push (bookworm, mysqlctld)	48s
Build and push (bookworm, mysqlctl)	44s
Build and push (bookworm, vtctl)	54s
Build and push (bookworm, vtctlclient)	52s
Build and push (bookworm, vtctld)	1m 44s
Build and push (bookworm, vtctldclient)	55s
Build and push (bookworm, logrotate)	25s
Build and push (bookworm, logtail)	42s
Build and push (bookworm, vtbackup)	54s
Build and push (bookworm, vtexplain)	44s
Slack Notification if failed	0s
	36m 47s

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