Improve Jest phabricator plugin

[mjesun]

Some changes were done to the jest-phabricator result processor; both for optimizing the size of the resulting JSON and for making the results shape more consistent. This is a summary on how the changes affect the current way of working of the plugin:

1. The additional level of indirection where all the results were copied inside aggregatedResult is gone. This way, the resulting data format is the same whether you use jest-phabricator or not.

2. Now we override coverageMap to place the coverage there. The standard coverage format is huge, and although the code said we will not include it in the final result for performance reasons, it was getting preserved inside aggregatedResult.coverageMap.

3. Coverage is not copied in each of the test results anymore, saving a lot of space. Together with the previous point, this means a decrease from 4.57 MiB to 763.75 KiB for the resulting JSON size on a ~800 tests run. That's 6x smaller!

4. One might argue that overriding coverageMap is bad, because we lose the original coverage information; however:

   • It was intentionally null-ified before on the main object to save space (which was not, because it was still in the aggregatedResult sublevel), but still, its value was null at the root.
   • Being at a non-standard place, no one complained for a lot of time, so probably it was not getting used.
   • If a custom reporter is being used for coverage purposes, probably you're not looking for the default way of reporting coverage either, so putting it where the usual coverage is, sounds reasonable to me.

5. Code is simpler. Yay!

[cpojer]

Great!!

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