Leverage internal HostUI for VT check (#1264)

Author: TylerLeonhardt

src/PowerShellEditorServices/Services/PowerShellContext/Session/Host/EditorServicesPSHostUserInterface.cs

@@ -67,12 +67,10 @@ internal abstract class EditorServicesPSHostUserInterface :
 
         #region Properties
 
-#if !PowerShellv3 && !PowerShellv4 && !PowerShellv5r1 // Only available in Windows 10 Update 1 or higher
         /// <summary>
         /// Returns true if the host supports VT100 output codes.
         /// </summary>
-        public override bool SupportsVirtualTerminal => true;
-#endif
+        public override bool SupportsVirtualTerminal => false;
 
         /// <summary>
         /// Returns true if a native application is currently running.

src/PowerShellEditorServices/Services/PowerShellContext/Session/Host/TerminalPSHostUserInterface.cs

@@ -65,6 +65,11 @@ public TerminalPSHostUserInterface(
 
         #endregion
 
+        /// <summary>
+        /// Returns true if the host supports VT100 output codes.
+        /// </summary>
+        public override bool SupportsVirtualTerminal => internalHostUI.SupportsVirtualTerminal;
+
         /// <summary>
         /// Gets a value indicating whether writing progress is supported.
         /// </summary>