Test case for the bug#31048 is moved to the subselect_notembedded tests as the embedded server isn't affected by this bug.


mysql-test/r/subselect.result:
  Test case for the bug#31048 is moved to the subselect_notembedded tests as the embedded server isn't affected by this bug.
mysql-test/r/subselect_notembedded.result:
  Test case for the bug#31048 is moved to the subselect_notembedded tests as the embedded server isn't affected by this bug.
mysql-test/t/subselect.test:
  Test case for the bug#31048 is moved to the subselect_notembedded tests as the embedded server isn't affected by this bug.
mysql-test/t/subselect_notembedded.test:
  Test case for the bug#31048 is moved to the subselect_notembedded tests as the embedded server isn't affected by this bug.