fix(occ): remove unused interval option

The implementation for the --interval option in occ background-job:worker has been removed a
year ago. This commit cleans up the option itself to avoid confusion.

Signed-off-by: Salvatore Martire <4652631+salmart-dev@users.noreply.github.com>

Author: salmart-dev

core/Command/Background/JobWorker.php

@@ -45,13 +45,6 @@ protected function configure(): void {
 				InputOption::VALUE_NONE,
 				'Only execute the worker once (as a regular cron execution would do it)'
 			)
-			->addOption(
-				'interval',
-				'i',
-				InputOption::VALUE_OPTIONAL,
-				'Interval in seconds in which the worker should repeat already processed jobs (set to 0 for no repeat)',
-				5
-			)
 			->addOption(
 				'stop_after',
 				't',