Don't force install Pylance on insiders VSIX install in VS Code 1.57+ #16384
Description
VS Code's update mechanism already knows what the user has uninstalled, but the installExtension command force installs all extension pack dependencies regardless. A new option (installOnlyNewlyAddedFromExtensionPackVSIX) allows installExtension to skip installing extension pack dependencies unless they are new, the same as on update.
Will be fixed in #16374, but filing for a changelog item.