Fixes #75758

Fix #75724

Also differentiate default from system shell

- get product configuration from server

Part of #75795

electron-browser/ will already prevent this

Cannot reproduce the failure locally, additionally it was a timeout but
it's not an async test...

Fixes #75772

Part of microsoft/vscode-remote-release#730

This reverts commit 28ab9ad9, reversing
changes made to 912ad66a.

This reverts commit 930290cf.

this change makes style changes visible to the mutation observer