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Remove imagePHIDs column from ConpherenceThread

Description

Remove imagePHIDs column from ConpherenceThread

Summary: Ref T11730. Removes the unused column, seen no issues during past week migrations.

Test Plan: Run migration, check database no longer contains column.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11730

Differential Revision: https://secure.phabricator.com/D16711