Remove calls to DifferentialRevision::loadRelations from commit workers
Summary:
Remove ocurrences of `loadRelations` in workers.
One was simply unnecesary, no subsequent call to `getReviewers` or `getCCPHIDs` was made.
The other was replaced with the nicer `DifferentialRevisionQuery` using `needRelations` and `needReviewerStatus` (for future upgrade).
Test Plan:
Land a revision into a tracked repository and check the parser worker attached the commit correctly.
For the owners worker I just checked it didn't crash into a hundred tiny pieces.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D6467
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