Online DDL: do not update last_throttled_timestamp with zero value #137

Job	Run time
Set push variable	1s
Build and push vttestserver (mysql80)	2m 0s
Build and push lite (latest)	2m 12s
Build and push lite (percona80)	2m 8s
Build and push (bullseye, vtadmin)	1m 11s
Build and push (bullseye, vtorc)	41s
Build and push (bullseye, vtgate)	42s
Build and push (bullseye, vttablet)	34s
Build and push (bullseye, mysqlctld)	36s
Build and push (bullseye, mysqlctl)	40s
Build and push (bullseye, vtctl)	45s
Build and push (bullseye, vtctlclient)	37s
Build and push (bullseye, vtctld)	1m 24s
Build and push (bullseye, vtctldclient)	43s
Build and push (bullseye, logrotate)	21s
Build and push (bullseye, logtail)	22s
Build and push (bullseye, vtbackup)	39s
Build and push (bullseye, vtexplain)	40s
Build and push (bookworm, vtadmin)	1m 13s
Build and push (bookworm, vtorc)	39s
Build and push (bookworm, vtgate)	38s
Build and push (bookworm, vttablet)	36s
Build and push (bookworm, mysqlctld)	33s
Build and push (bookworm, mysqlctl)	38s
Build and push (bookworm, vtctl)	44s
Build and push (bookworm, vtctlclient)	26s
Build and push (bookworm, vtctld)	1m 16s
Build and push (bookworm, vtctldclient)	25s
Build and push (bookworm, logrotate)	26s
Build and push (bookworm, logtail)	27s
Build and push (bookworm, vtbackup)	43s
Build and push (bookworm, vtexplain)	39s
	25m 39s

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