Perf | avoid copying of an array for SqlGuid in TdsParser

similar how it's don for netfx

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParser.cs

@@ -5932,7 +5932,7 @@ internal bool DeserializeUnencryptedValue(SqlBuffer value, byte[] unencryptedByt
                 case TdsEnums.SQLUNIQUEID:
                     {
                         Debug.Assert(length == 16, "invalid length for SqlGuid type!");
-                        value.SqlGuid = new SqlGuid(unencryptedBytes);   // doesn't copy the byte array
+                        value.SqlGuid = SqlTypeWorkarounds.SqlGuidCtor(unencryptedBytes, true);   // doesn't copy the byte array
                         break;
                     }