R1:da1531f219d0

Policy - make ManiphestTaskQuery verify project visibility first thing

Summary: Fixes T7094 (last of many revisions). Its important to do this filtering ASAP so that users can't deduce the identify of an unknown / invisible project.

Test Plan: executed a query for tasks in project foo using user bar. using user foo, lock user bar out of project foo. reissued the query and saw "no data" as well as "restricted project" in the project typeahead.

Reviewers: epriestley

Reviewed By: epriestley

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