Add an item to source control does not update uncommitted queue

[isc-pbarton]

• Create a new item in Studio / VS Code
• Use the "Add" menu option to add it to source control
• In the Workspace view of the web UI, the change shows the icon saying it belongs to a different user.
• Use the "Status" menu option
• Now the Workspace view will show the change as belonging to me.

The cause is that AddToSourceControl does not add the item to the SourceControl.Git.Change table.