Improve terminal grid dimensions caching

Fixes #77132

Add support for loading webviews from and endpoint that looks like:

```
https://{{uuid}}.contoso.com/path/to/some/commit/index.html
```

This lets us serve each webview from a seperate origin

fix(sash): dragging being difficult with iframe-containing extensions

Make sure we handle the Disposable returned from showActivity

The grammar is contributed by the language basics extension

Don't show quick fix link in problem hovers until we know we have quick fixes

Avoid using untracked IDisposables in workbench/contrib/extensions

trigger workspace contains activation event on new folders

Fix-73341 Installing extension from extension page "Install" button keeps the notification baloon in bottom right

Changed id to displayName, fixes #77141

Fixes #77094

Part of #77228

chore: Bump node-pty@0.9.0-beta19