Add action to reload the window with disableExtensions set, #43156

Fixes #42629

Fixes #44039

Add a new option that lets extensions override which root folders a webview can load local resources from. Defaults to allowing any resource in the workspace

The `options` argument of `_workbench.previewHtml` was never properly documented and never offically supported.

Fixes #42311

Fixes #44068

Part of #44068

Fixes #43558

Fixes #44145

Setting to center the layout when turning on the zen mode