R1:51461f18c15b

When publishing buildables in Differential, ignore autobuilds (local lint and unit)

Summary:
Depends on D19280. Ref T13110. Although Harbormaster cares about all builds, Differential does not practically care about local lint and unit results in determining build status.

In Differential, orient publishing around "remote builds" instead of "builds".

This does not yet change any of the draft logic, it just makes the timeline story use newer logic.

Test Plan: Used `bin/harbormaster publish` (with some…