Use http4s-blaze-client in the Auth0 user bulk insert endpoint call

[Aaron Su]

We use sttp on our backend to make requests to Auth0 management API's users-imports endpoint to kick off a job to import multiple users in one go. Due to dependency issues in the versions used for sttp and circe, pretty method from the latter is missing but is called in the former. See the logs below.

We should use http4s-blaze-client instead for calling this Auth0 endpoint. See an example here: https://github.com/raster-foundry/raster-foundry/pull/5610/files#diff-15e0ac2d7721a3fea9d2ce1d32cd0a54cf3e6377e300e2439e1c990faf45a776