[BUGFIX] Set tasks backend:lock & backend:unlock as not schedulable

The tasks `backend:lock` and `backend:unlock` must only be triggered
by commandline and not via backend as this doesn't make any sense.
Any admin would disable his own account by locking via backend and there
is no chance to unlock it again.

Resolves: #89387
Releases: master, 9.5
Change-Id: Ief460cfc033b555e77869b22b61b05c57a27d1a7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61938


Tested-by: Christian Eßl <indy.essl@gmail.com>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Tested-by: Henning Liebe <h.liebe@neusta.de>
Tested-by: Richard Haeser <richard@maxserv.com>
Reviewed-by: Christian Eßl <indy.essl@gmail.com>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Reviewed-by: Henning Liebe <h.liebe@neusta.de>
Reviewed-by: Richard Haeser <richard@maxserv.com>

typo3/sysext/backend/Configuration/Commands.php

@@ -9,10 +9,12 @@
  */
 return [
     'backend:lock' => [
-        'class' => \TYPO3\CMS\Backend\Command\LockBackendCommand::class
+        'class' => \TYPO3\CMS\Backend\Command\LockBackendCommand::class,
+        'schedulable' => false
     ],
     'backend:unlock' => [
-        'class' => \TYPO3\CMS\Backend\Command\UnlockBackendCommand::class
+        'class' => \TYPO3\CMS\Backend\Command\UnlockBackendCommand::class,
+        'schedulable' => false,
     ],
     'referenceindex:update' => [
         'class' => \TYPO3\CMS\Backend\Command\ReferenceIndexUpdateCommand::class