R1:00f864b35930

Quicksand - fix project board page and quicksand

Summary: Fixes T7913. Collapse the separate board dropdown into the board projects behavior; we always need that anyway and now we can install the listener more granularly.

Test Plan:
- visted project board
- invoked create task, cancelled dialog
- visited project feed
- visited project board
- invoked create task, cancelled dialog (FAILED pre patch...!)

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

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