Make it easier for people to share their own TFB results

[michaelhixson]

1. Add a rendering mode to the results website that accepts two URLs: one for the results.json, one for test_metadata.json. This will be missing some "attributes" data that is currently required by the results website, so the results website will need to be auto-generate these attributes on the fly using only those two JSON files as input.
2. Consider changing the TFB toolset to append test_metadata.json into a new key in results.json. Don't get rid of the standalone test_metadata.json yet, because that'll break stuff. Change the results website to not require that 2nd external URL when rendering if the metadata is already in the results.
3. Add results.json-pastebin functionality somewhere, probably tfb-status, so that people don't have to provide their own hosting.

[michaelhixson]

@msmith-techempower @nbrady-techempower Do either of you object to item 2 here, which would mean putting test_metadata.json's content into results.json? Also, if test_metadata.json is currently created at the end of the run, I'd want it to be created at the beginning.

I'm asking now before Shay starts working on that change.

[NateBrady23]

@michaelhixson No objection here. I think it makes sense.