Throw a correct exception from SqlServerClient#listSchemas

Do not throw a generic `RuntimeException`, but a correct
`TrinoException` with the `JDBC_ERROR` error code. This is, among other
things, what the test framework requires.

Author: ksobolew

plugin/trino-sqlserver/src/main/java/io/trino/plugin/sqlserver/SqlServerClient.java

@@ -394,7 +394,7 @@ public Collection<String> listSchemas(Connection connection)
             return schemaNames.build();
         }
         catch (SQLException e) {
-            throw new RuntimeException(e);
+            throw new TrinoException(JDBC_ERROR, e);
         }
     }