R1:7beae445e9ee

Clear project notifications when viewing workboard or project detail

Summary: Fixes T8112.

Test Plan:
- Sent notifications.
- Notied them un-cleared by clicking them (profile or workboard).
- Made changes.
- Verified profile and workboard both clear them.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T8112

Differential Revision: https://secure.phabricator.com/D12771