test(v2/httpclient): run in parallel

Kev Klossrequested to merge
kev-httpclient-test-parallel into master

This runs the v2/httpclient unit test suite in parallel. This is for two reasons:

  1. It makes tests run slightly faster (here: from 4s to 3s) and
  2. it implicitly helps us discover problems should the client ever rely on global state.

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