Use correct /v3 prefix for /refresh (#3016)
* Add tests to ensure /v3/refresh is called + automatic /v1 retry
* Request /refresh with v3 prefix, and quietly fall back to v1
* Add tests checking re-raising errors
* Update spec/unit/login.spec.ts
* Update comment
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
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Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
