Temporarily(?) remove BRIN isolation test.

Commit 2834855cb added a not-very-carefully-thought-out isolation test
to check a BRIN index bug fix.  The test depended on the availability
of the pageinspect contrib module, which meant it did not work in
several common testing scenarios such as "make check-world".  It's not
clear whether we want a core test depending on a contrib module like
that, but in any case, failing to deal with the possibility that the
module isn't present in the installation-under-test is not acceptable.

Remove that test pending some better solution.

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