R1:731b45d81847

In "bin/repository reparse", continue on "PhabricatorWorkerPermanentFailureException"

Summary:
Fixes T13315. See that task for discussion.

Without `--background`, we currently treat this as a catastrophic failure, but it's relatively routine for some repository states. We can safely continue reparsing other steps.

Test Plan: Ran `bin/repository reparse --all X --message` with commits faked to all be unreachable. Got warnings instead of a hard failure on first problem.

Reviewers: amckinley

Reviewed By…