And remove the qlpack referred to therein.
Instead we rename and duplicate the extesion file
that this qlpack pointed to.
These two extension files are kept in sync by `identical-files.json`.
For these tests, we cannot use the same mechanism, as we want the
data extensions to be available for both tests.
Instead, we create a ql-pack for the test directory and point to
the data entensions from there. This makes the extensions
available for all tests in the directory.
