Fixes https://github.com/microsoft/vscode/issues/112078

Fixes https://github.com/microsoft/vscode/issues/109902

Fixes https://github.com/microsoft/vscode-internalbacklog/issues/1472

Fixes https://github.com/microsoft/vscode/issues/105859

https://github.com/microsoft/vscode/issues/100368

Fixes https://github.com/microsoft/vscode/issues/103708

Adds a simple set of tests for custom editors in a new extension. This is currently not run during CI since we want more testing to make sure it is reliable

Fixes https://github.com/microsoft/vscode-js-debug/issues/554

Allow auto fixing add missing imports if:

- There is only one possible import
- And there are no better fixes (such as spelling changes)

It can take a long time to start up the client on Windows