e2e framework change to find empty throttler config (#17228) #434

Job	Run time
Build and push lite (latest)	4m 16s
Build and push vttestserver (mysql80)	2m 45s
Build and push lite (percona80)	4m 31s
Build and push (bullseye, vtadmin)	1m 32s
Build and push (bullseye, vtorc)	47s
Build and push (bullseye, vtgate)	52s
Build and push (bullseye, vttablet)	58s
Build and push (bullseye, mysqlctld)	37s
Build and push (bullseye, mysqlctl)	44s
Build and push (bullseye, vtctl)	44s
Build and push (bullseye, vtctlclient)	48s
Build and push (bullseye, vtctld)	1m 31s
Build and push (bullseye, vtctldclient)	34s
Build and push (bullseye, logrotate)	21s
Build and push (bullseye, logtail)	28s
Build and push (bullseye, vtbackup)	44s
Build and push (bullseye, vtexplain)	44s
Build and push (bookworm, vtadmin)	1m 35s
Build and push (bookworm, vtorc)	1m 0s
Build and push (bookworm, vtgate)	1m 5s
Build and push (bookworm, vttablet)	1m 8s
Build and push (bookworm, mysqlctld)	58s
Build and push (bookworm, mysqlctl)	49s
Build and push (bookworm, vtctl)	1m 7s
Build and push (bookworm, vtctlclient)	51s
Build and push (bookworm, vtctld)	1m 45s
Build and push (bookworm, vtctldclient)	39s
Build and push (bookworm, logrotate)	44s
Build and push (bookworm, logtail)	53s
Build and push (bookworm, vtbackup)	41s
Build and push (bookworm, vtexplain)	53s
Slack Notification if failed	0s
	37m 4s

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