FIX: Migrate topic_users.bookmarked to false when it is incorrectly true (PR #10211)

Follow up to https://github.com/discourse/discourse/pull/10188/files

There are still TopicUser records where bookmarked is true even though there are no Bookmark or PostAction records with the type of bookmark for the associated topic and user. This migration corrects this issue by setting bookmarked to false for these cases.

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