#15293

#10587

- Include extension specific properties only
- Refactor: Move extensions scanning to MainThreadExtensionService

* Use the extension descriptions available in the UI thread
* Don't wait for handling extension points until extension host is running
* Create the extension host process only after extension points have been handled
* Send the initial configuration as part of the initData to the extension host

Due to issues #14151, #14149 & #14182

Fixes #14066

The dep can't be fulfilled on main process