Move to the CircleCI v2 api as the authentication fails for downloading artifacts using the v1 methods.
CircleCI v2 api now requires authentication to occur view the headers instead of being done in a
query parameter, all of the CircleCI interactions are now performed through one fetchFromCircleCi method
which ensures the token is provided in the headers as expected.
PR Close#45349
Previously, Travis pushed the build artitfacts to the preview server.
This required us to use JWT to secure the POST request from Travis, to
ensure we couldn't receive malicious builds.
JWT has been deprecated and we are moving our builds to CircleCI.
This commit rewrites the TypeScript part of the preview server that
handles converting build artifact into hosted previews of the docs.
George Kalpakas