[YSQL] pgsql_proxy_bind_address=127.0.0.1:5434,127.0.0.2:5436 results in PG crash

Jira Link: DB-18336

Description

This tserver gflag is being transformed to the PG listen_addresses and port parameter. PG only supports a single port in its listen specification, so the above specification should be rejected as invalid. Instead, a mix of ports is used to start PG and create the socket path, causing PG to fail startup.

https://www.postgresql.org/docs/current/runtime-config-connection.html#:~:text=Note%20that%20the%20same%20port%20number%20is%20used%20for%20all%20IP%20addresses%20the%20server%20listens%20on

Issue Type

kind/bug

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