FIX: Set invited PM users to watch so they receive notifications #35722
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When a user is invited to an existing private message, they were not receiving notifications for subsequent messages. This occurred because
TopicUserrecords are created lazily when a user first visits a topic, butPostAlerter#notify_pm_userschecks the notification level immediately when determining who should receive notifications.This PR explicitly creates a
TopicUserrecord with its notification level set towatchingimmediately after granting PM access, ensuring the invited user receives notifications for all subsequent messages even before their first visit.