[TASK] Remove skipped FAL functional tests

Utility/File/ExtendedFileUtilityTest.php contains some old FAL
related tests that are not maintained for quite some time, broken
and skipped.
Functional tests for FAL should be re-written if needed from scratch
so these tests are removed for now.

Resolves: #60541
Releases: 6.3, 6.2
Change-Id: Ib703f5c4bbd5d52ef5c67f0fc2f2387772c315fd
Reviewed-on: http://review.typo3.org/31769
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>