Fix duplicate reports being sent when reporting some remote posts #27355
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Whenever a remote post in reply to the same server is replied to, Mastodon may send two copies of the
Flag
activity: one for the reported user, and one for people being replied to.This is because the report is sent to the reported account's personal inbox (not changed, in case other software rely on this) and reports to replied-to users are sent using shared inbox, with the existing deduplication logic not accounting for this discrepancy.