Simplify exception message in HiddenTargetColumn testing

Author: edwardneal

src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/SqlBulkCopyTest/HiddenTargetColumn.cs

@@ -56,7 +56,7 @@ Column2 nvarchar(10) not null,
                             SqlException sqlEx = Assert.Throws<SqlException>(() => bulkcopy.WriteToServer(reader));
 
                             Assert.Equal(13536, sqlEx.Number);
-                            Assert.StartsWith($"Cannot insert an explicit value into a GENERATED ALWAYS column in table '{dstConn.Database}.dbo.{destinationTable.Replace("[", "").Replace("]", "")}'.", sqlEx.Message);
+                            Assert.StartsWith($"Cannot insert an explicit value into a GENERATED ALWAYS column in table, sqlEx.Message);
                         }
                     }
                 }