Existing query tabs are not updated when connection is edited

Describe the bug

When the connection is edited (specifically, to change the username/password), any existing query tabs are not updated. They will continue to use previous connection properties, not the new ones.

To Reproduce

Steps to reproduce the behavior:

1. Connect to a database as one user (with limited permissions). Open a query tab and run a query that will fail due to incorrect permissions.
2. Edit the connection, changing to another user (with limited permissions).
3. The existing query window still fails with incorrect permissions.

Expected behavior

The existing query tab runs with the correct permissions.

OR

There is some UI indicating that the existing query tab is using outdated connection properties.

Screenshots

VS Code version

Version: 1.104.2 (user setup)
Commit: e3a5acfb517a443235981655413d566533107e92
Date: 2025-09-24T11:21:37.073Z (1 wk ago)
Electron: 37.3.1
ElectronBuildId: 12404162
Chromium: 138.0.7204.235
Node.js: 22.18.0
V8: 13.8.258.31-electron.0
OS: Windows_NT x64 10.0.26100

No source files or tests are named. Reproduce the connection-edit flow in the PostgreSQL extension, then trace how existing query tabs obtain connection properties; done means they use the edited credentials or clearly indicate they are stale, with regression coverage for the reported sequence.