Remove unused job_phases parameters in SingleBuild
Remove unused job_phases parameters in SingleBuild

Summary: Avoids giving the impression that the phase data is used more broadly than it is.

Test Plan: Manual

Reviewers: paulruan

Reviewed By: paulruan

Subscribers: changesbot

Projects: #changes_ui

Differential Revision: https://tails.corp.dropbox.com/D190736

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