Revert "Remove --tag next from npm publish command on main branch."
Revert "Remove --tag next from npm publish command on main branch."

This reverts commit 9eb93c72045294e1d2541e29f42d437128003647, since I
think it might actually be a good policy to publish all versions with
the 'next' npm dist-tag at first, and later promote them to 'latest',
pending final validation steps.

apollographql/apollo-client,apollographql/apollo-client