Revert "Add support for "workspaces" based on window names (#20162)" (#20291)

This reverts commit 4b8b6ffc67: Add
support for "workspaces" based on window names (#20162)

@DHowett found the following blocking issues:
-
https://github.com/microsoft/terminal/pull/20162#discussion_r3359134869
- unrelated changes in `tools/runformat.cmd` and `OpenConsole.psm1`

src/cascadia/TerminalApp/TabRowControl.idl

@@ -9,7 +9,5 @@ namespace TerminalApp
         TabRowControl();
         Microsoft.UI.Xaml.Controls.TabView TabView { get; };
         Boolean ShowElevationShield;
-        Boolean ShowWorkspacesButton;
-        String WorkspaceName;
     }
 }