Add Open Graph protocol meta tags to Maniphest task pages
89778dc9e617
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Description

Add Open Graph protocol meta tags to Maniphest task pages

Summary:
Add OGP <meta> tags to Maniphest task pages when the task is publicly accessible and anonymously accessed. See https://ogp.me/

Based on rP2c72c2b924ffa3f8a49dbec636a2cdca3bae004f reverted in rP49b57eae7df52c189aef1d973823c697fc97fd4b.

Closes T15472

Test Plan:

Use the default Phorge logo, open a Maniphest task, look at the headers in its HTML.
Set a custom Phorge logo via config/edit/ui.logo/.
Access a task with "View Policy: All Users" while logged in: No OGP headers included.
Access a task with "View Policy: Public" while logged in: No OGP headers included.
Access a task with "View Policy: All Users" while logged out: No OGP headers included; "Access Denied: Restricted Maniphest Task" displayed.
Access a task with "View Policy: Public" while logged out: OGP headers included.
Access a task with "View Policy: Public" while logged out with a task description and a task without a task description: OGP headers included.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15472