refactor: rename DefaultKeyspace() to CurrentKeyspace() (#17303) #474

Job	Run time
Build and push vttestserver (mysql80)	2m 27s
Build and push lite (latest)	4m 27s
Build and push lite (percona80)	4m 43s
Build and push (bullseye, vtadmin)	1m 19s
Build and push (bullseye, vtorc)	49s
Build and push (bullseye, vtgate)	47s
Build and push (bullseye, vttablet)	45s
Build and push (bullseye, mysqlctld)	41s
Build and push (bullseye, mysqlctl)	41s
Build and push (bullseye, vtctl)	49s
Build and push (bullseye, vtctlclient)	40s
Build and push (bullseye, vtctld)	1m 44s
Build and push (bullseye, vtctldclient)	48s
Build and push (bullseye, logrotate)	20s
Build and push (bullseye, logtail)	19s
Build and push (bullseye, vtbackup)	44s
Build and push (bullseye, vtexplain)	48s
Build and push (bookworm, vtadmin)	1m 27s
Build and push (bookworm, vtorc)	40s
Build and push (bookworm, vtgate)	41s
Build and push (bookworm, vttablet)	51s
Build and push (bookworm, mysqlctld)	53s
Build and push (bookworm, mysqlctl)	51s
Build and push (bookworm, vtctl)	46s
Build and push (bookworm, vtctlclient)	52s
Build and push (bookworm, vtctld)	1m 44s
Build and push (bookworm, vtctldclient)	45s
Build and push (bookworm, logrotate)	25s
Build and push (bookworm, logtail)	28s
Build and push (bookworm, vtbackup)	44s
Build and push (bookworm, vtexplain)	42s
Slack Notification if failed	0s
	34m 40s

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