Remove automated emergency shutdown tests from the manual test suite.

Will-fix: #5472

wiki/src/contribute/release_process/test.mdwn

@@ -143,15 +143,6 @@ tracked by tickets prefixed with `todo/test_suite:`.
 * When we receive this bug report on the tails-bugs mailing-list,
   Schleuder tells us that it was sent encrypted.
 
-# Erase memory on shutdown
-
-- After booting from DVD, remove Tails boot medium and check that the
-  memory erasure process is started (`Loading new kernel`, at least).
-  (automate: [[!tails_ticket 5472]])
-- After booting from USB, remove Tails boot medium and check that the
-  memory erasure process is started (`Loading new kernel`, at least).
-  (automate: [[!tails_ticket 5472]])
-
 # Root access control
 
 * Check you cannot login as root with `su` neither with the `amnesia` password nor