Give "Arcanist Client Results" a more clear name

Summary: Fixes T9380. See that task for discussion. This doesn't feel awesome but is maybe the least-bad fix? I think this name is clearer.

Test Plan: Looked at autoplan in Harbormaster, saw new name.

Reviewers: meitros, chad

Reviewed By: chad

Maniphest Tasks: T9380

Differential Revision: https://secure.phabricator.com/D14088