[webviews] deserializeWebviewPanel is not called when switching workspace trust to restricted

Does this issue occur when all extensions are disabled?: Yes/No

It is a custom extension which uses the Webview Api.

• VS Code Version: 1.83.0
• OS Version: Ubuntu 23.04

Steps to Reproduce:

1. Use a webview which implements deserializeWebviewPanel
2. Write console.log() statements when extension starts, ends, registers deserializeWebviewPanel and inside deserializeWebviewPanel
3. Notice that on VSCode reload deserializeWebviewPanel is called, on workspace trust change to false the extension is reloaded but deserializeWebviewPanel is not called.
4. The webview becomes unusable as it is not tracked anymore by the extension (trust=false restarts extension apparently).

First lines are printed when Reload Window is triggered. Last lines when switching the workspace trust to false:

Possible workarounds:

Use onDidGrantWorkspaceTrust which is fired only when trusting the workspace + window.tabGroup Api (available from 1.67) to find the Panel and reuse it.