Fix upgrade test in release-20 by skipping tests #1007

Job	Run time
Set push variable	1s
Build and push lite (latest)	2m 17s
Build and push vttestserver (mysql80)	1m 59s
Build and push lite (percona80)	2m 18s
Build and push (bullseye, vtadmin)	1m 13s
Build and push (bullseye, vtorc)	37s
Build and push (bullseye, vtgate)	27s
Build and push (bullseye, vttablet)	39s
Build and push (bullseye, mysqlctld)	42s
Build and push (bullseye, mysqlctl)	38s
Build and push (bullseye, vtctl)	41s
Build and push (bullseye, vtctlclient)	40s
Build and push (bullseye, vtctld)	1m 22s
Build and push (bullseye, vtctldclient)	44s
Build and push (bullseye, logrotate)	47s
Build and push (bullseye, logtail)	29s
Build and push (bullseye, vtbackup)	43s
Build and push (bullseye, vtexplain)	43s
Build and push (bookworm, vtadmin)	1m 35s
Build and push (bookworm, vtorc)	43s
Build and push (bookworm, vtgate)	26s
Build and push (bookworm, vttablet)	45s
Build and push (bookworm, mysqlctld)	42s
Build and push (bookworm, mysqlctl)	30s
Build and push (bookworm, vtctl)	26s
Build and push (bookworm, vtctlclient)	44s
Build and push (bookworm, vtctld)	1m 34s
Build and push (bookworm, vtctldclient)	40s
Build and push (bookworm, logrotate)	24s
Build and push (bookworm, logtail)	31s
Build and push (bookworm, vtbackup)	48s
Build and push (bookworm, vtexplain)	26s
	27m 14s

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