Remove completer argument.

Author: Nemanja Mijatovic (E-Search)

src/Sql/Sql/Common/Constants.cs

@@ -32,6 +32,5 @@ public class Constants
         public const string ComputeGenerationGen5 = "Gen5";
         public const string CollationSqlLatin1 = "SQL_Latin1_General_CP1_CI_AS";
         public const string CollationLatin1 = "Latin1_General_100_CS_AS_SC";
-        public const string TimeZoneUtc = "UTC";
     }
 }

src/Sql/Sql/ManagedInstance/Cmdlet/NewAzureSqlManagedInstance.cs

@@ -173,7 +173,6 @@ public class NewAzureSqlManagedInstance : ManagedInstanceCmdletBase
         [Parameter(Mandatory = false,
             HelpMessage = "The time zone id for the instance to set. A list of time zone ids is exposed through the sys.time_zone_info (Transact-SQL) view.")]
         [ValidateNotNullOrEmpty]
-        [PSArgumentCompleter(Constants.TimeZoneUtc)]
         public string TimezoneId { get; set; }
 
         /// <summary>