TASK-1050 some frontend test refactoring

[briehl]

Tests should now generate code coverage (still pending some checking to see if that functions properly. Even with more complete tests, it seems like there's some false negatives).

There's also a test utility module that helps manage tokens.

(doing these later)
TODO:
Add util for creating a narrative
Add util for uploading test data
Add util for deleting workspaces (maybe. might also just wait until the Mini-KBase stuff is done and operate against that environment)

[briehl]

There's still some TODOs that'll make life easier, but I think we should get this merged, if only to expose coverage and Auth2 token use.

@eapearson @sychan mind taking a look here?

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