[build-utils] Remove `now-next` and `now-static-build` tests (#5695)
[build-utils] Remove `now-next` and `now-static-build` tests (#5695)

These directories are no longer in this repository, so the tests were failing.
zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli,zeit/now-cli