R1:92b73fed6b2c

Don't apply space constraints to omnipotent-viewer queries

Summary:
Fixes T8743. Fixes T8746. When running queries with the omnipotent viewer and no explicit space constraints, don't add implicit space constraints.

This prevents us from fataling when running older pre-space migrations and trying to load space-aware objects.

Test Plan: Manually ran migrations with `--trace`, verified no `WHERE spacePHID = ...`.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: eadler, epriestley

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