actions: look up action tasks by revision in fetch_graph_and_labels #589
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Projects on github don't have a meaningful pushlog-id, so we don't use it in the index path for action tasks. When building the label-to-taskid mapping for a revision, look up action tasks in the index using the head_rev, where we can actually find them.
This can potentially do the wrong thing if a revision is pushed to two different branches, where we'd be mixing up the graphs, but we don't currently include the branch name in the index paths.