Support port in ServerName for connection strings

Describe the bug

I have multiple postgresql version which uses different ports.
Upon checking, ports are not recognized in the Server Name
It can only be set via advanced settings but it isn't set when connecting via connection string.

Ports are not supported when using "hostname:port" format

To Reproduce

1. Set server name to "localhost:5432" (Specify default port)
2. Test Connection
3. Set server name to "localhost:5433" (Specify custom port for a different postgresql version)
4. Test Connection

Expected behavior
It should connect successfully since 5432 is the default port and also 5433 for the custom port

Actual behavior
Both: Connection error: [Errno 11001] getaddrinfo failed

VS Code version

Version: 1.102.1 (user setup)
Commit: 7adae6a56e34cb64d08899664b814cf620465925
Date: 2025-07-15T16:41:17.147Z
Electron: 35.6.0
ElectronBuildId: 11847422
Chromium: 134.0.6998.205
Node.js: 22.15.1
V8: 13.4.114.21-electron.0
OS: Windows_NT x64 10.0.19045

The issue does not name files or tests. Start by tracing how connection strings are parsed and how PostgreSQL connection settings are passed to the client; verify that both localhost:5432 and localhost:5433 use the parsed host and port, then reproduce the two connection attempts from the report.