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