R1:312ba3071485

Don't report search indexing errors to the daemon log except from "bin/search index"

Summary:
Depends on D20177. Fixes T12425. See <https://discourse.phabricator-community.org/t/importing-libphutil-repository-on-fresh-phabricator-triggers-an-error/2391/>.

Search indexing currently reports failures to load objects to the log. This log is noisy, not concerning, not actionable, and not locally debuggable (it depends on the reporting user's entire state).

I think one common, fully legitimate case of this is…