Add missing MEL log levels to the LogLevel parameter in Start-EditorServices.ps1 (#2235)

This commit adds `Trace`, `Debug`, `Information`, `Critical`, and `None`
to the validation set on the `LogLevel` parameter when starting PSES
using `Start-EditorServices.ps1` to allow for the adoption of the newer
MEL log levels.

Author: eitamal

module/PowerShellEditorServices/Start-EditorServices.ps1

@@ -46,7 +46,7 @@ param(
     [ValidateNotNullOrEmpty()]
     $LogPath,
 
-    [ValidateSet("Diagnostic", "Verbose", "Normal", "Warning", "Error")]
+    [ValidateSet("Diagnostic", "Verbose", "Normal", "Warning", "Error", "Trace", "Debug", "Information", "Critical", "None")]
     $LogLevel,
 
 	[ValidateNotNullOrEmpty()]