[lib] Only list sidebars that pass threadInChatList
[lib] Only list sidebars that pass threadInChatList

Summary: For a sidebar to appear in the `ChatThreadList`, the viewer must be a member and has the `VISIBLE` permission

Reviewers: KatPo, palys-swm

Reviewed By: KatPo

Subscribers: zrebcu411, Adrian

Differential Revision: https://phabricator.ashoat.com/D147

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