connection pool: max idle connections implementation (#17443) #544

Job	Run time
Build and push lite (latest)	4m 30s
Build and push vttestserver (mysql80)	2m 25s
Build and push lite (percona80)	4m 35s
Build and push (bullseye, vtadmin)	1m 18s
Build and push (bullseye, vtorc)	41s
Build and push (bullseye, vtgate)	46s
Build and push (bullseye, vttablet)	48s
Build and push (bullseye, mysqlctld)	51s
Build and push (bullseye, mysqlctl)	49s
Build and push (bullseye, vtctl)	52s
Build and push (bullseye, vtctlclient)	47s
Build and push (bullseye, vtctld)	1m 36s
Build and push (bullseye, vtctldclient)	45s
Build and push (bullseye, logrotate)	24s
Build and push (bullseye, logtail)	32s
Build and push (bullseye, vtbackup)	47s
Build and push (bullseye, vtexplain)	45s
Build and push (bookworm, vtadmin)	1m 20s
Build and push (bookworm, vtorc)	55s
Build and push (bookworm, vtgate)	47s
Build and push (bookworm, vttablet)	53s
Build and push (bookworm, mysqlctld)	36s
Build and push (bookworm, mysqlctl)	56s
Build and push (bookworm, vtctl)	50s
Build and push (bookworm, vtctlclient)	45s
Build and push (bookworm, vtctld)	1m 41s
Build and push (bookworm, vtctldclient)	55s
Build and push (bookworm, logrotate)	36s
Build and push (bookworm, logtail)	31s
Build and push (bookworm, vtbackup)	49s
Build and push (bookworm, vtexplain)	52s
Slack Notification if failed	0s
	35m 37s

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