refactor: Use Nextcloud sets for rector · nextcloud/mail@294b89a

lib/Controller/AccountsController.php:72:26: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/AliasesController.php:34:26: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/AvatarsController.php:36:16: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/DraftsController.php:44:19: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/GoogleIntegrationController.php:49:19: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/LocalAttachmentsController.php:38:19: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/MailboxesController.php:55:26: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/MessagesController.php:105:26: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/MicrosoftIntegrationController.php:41:19: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

lib/Controller/OutboxController.php:41:19: UndefinedVariable: Cannot find referenced variable $UserId (see https://psalm.dev/024)

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