R1:60a529b9d192

Remove some obsolete lint and unit support

Summary:
Ref T8096.

Long ago, support for "postponed" lint and unit tests got hacked in. `arc` would publish a bunch of ghost results, and then something else would fill the results in later.

This was always a hack. It is not nearly as powerful or flexible as having a real build system, and is obsolete with Harbormaster, which supports these operations in a more reasonable and straightforward way.

This was used (only? almost only?) at Facebook.

- Remove…