Refactor action output dumping to go through a single method.

This is in preparation for moving the output dumping to the Reporter for
two reasons:
- we're currently relying on there being a Reporter which locks on itself;
  i.e., this code is tightly coupled with the Reporter code
- the current Blaze output is confusing; we first print an info event, then
  the actual output, and then an error event - putting the Reporter in control
  allows us to fix that

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MOS_MIGRATED_REVID=112240684

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