fix(files_trashbin): make trashbin:expire continue on errors

[benjaminfrueh]

Summary

Since version 34 occ trashbin:expire had three potential issues introduced by the refactor in #54876

1. False "Unknown user" + abort:
   After successfully expiring an existing user, the command outputs Unknown user <uid>, returns 1 and aborts after the first user.

   server/apps/files_trashbin/lib/Command/ExpireTrash.php

   Lines 66 to 71 in 463c9bd

   	if ($user) {
   	$output->writeln("Remove deleted files of <info>$userId</info>");
   	$this->expireTrashForUser($user, $output);
   	$output->writeln("<error>Unknown user $userId</error>");
   	return 1;
   	} else {

2. Crash on users without a trash bin:
   getTrashRoot() uses ->get('files_trashbin') which throws NotFoundException if the folder doesn't exist, this should not be an error and not abort the job as the trashbin seems to be created on a users first delete.
3. Error is rethrown and aborts job:
   Errors in expireTrashForUser() are rethrown so the loop aborts and every user after the failing one is skipped. Before refactor: Commands and background jobs for the trashbin #54876 the errors were logged and the loop continued.
   

   server/apps/files_trashbin/lib/Command/ExpireTrash.php

   Lines 95 to 97 in 463c9bd

   	} catch (\Throwable $e) {
   	$output->writeln('<error>Error while expiring trashbin for user ' . $user->getUID() . '</error>');
   	throw $e;

Feedback or further suggestions welcome.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI (review and test refactor)

[benjaminfrueh]

/backport to stable35

[benjaminfrueh]

/backport to stable34

[szaimen]

🐘