Skip test that hits Emacs 28 bug

A recent change in the development version of Emacs 28 has resulted
in un-catchable quit conditions when quitting a minibuffer session
from a kbd macro, which is how the batch-run Ivy test suite emulates
interactive user input.

See issue abo-abo#2906 and https://bugs.gnu.org/48603.

* ivy-test.el (ivy-partial-files): Skip on Emacs 28 for now.

ivy-test.el

@@ -1136,6 +1136,9 @@ Since `execute-kbd-macro' doesn't pick up a let-bound `default-directory'.")
            :dir "/tmp/"))))
 
 (ert-deftest ivy-partial-files ()
+  ;; FIXME: Can't catch `quit' condition.
+  ;; See issue #2906 and https://bugs.gnu.org/48603.
+  (skip-unless (< emacs-major-version 28))
   (when (file-exists-p "/tmp/ivy-partial-test")
     (delete-directory "/tmp/ivy-partial-test" t))
   (mkdir "/tmp/ivy-partial-test/test1" t)