R1:793eced32dd2

Modernize "projects" typeahead datasource

Summary: Ref T4420. Update "projects" source.

Test Plan:
- Edited projects on a Differential revision.
- Edited projects on a commit.
- Edited projects on a repository.
- Edited projects in feed search.
- Edited projects in a Herald rule field.
- Edited projects in a Herald rule action.
- Edited projects in Maniphest batch editor.
- Edited projects on Maniphest task.
- Edited projects in "Associate Projects..." action in Maniphest.
- Edited projects on Maniphest…