feat(pgsql): resort to servers with weight = 0 if all connections are used#4980

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TPXP wants to merge 3 commits intosysown:v3.0from

TPXP:v3.0-backup-srv

Commits on Jun 4, 2025

enh: update missing openssl error to suggest missing pkg-config
TPXP
committed
wip: if all servers have reached max_connections but there is a server with weight=0, use it
TPXP
committed
ref: revamp the weight==0 behaviour to avoid touching weights
TPXP
committed