Lift restriction on publishing embedded SDKs from the 4.7.0 branch

We currently disallow pushes of the embedded SDKs on master, since the 4.dev non-semver setup would have overwritten the published packages from 4.4: https://github.com/mongodb/mongo/blob/8a89b076d28a904c200e491698ef1169dd8a7254/etc/evergreen.yml#L885 After we have forked/tagged things such that we are producing 4.7.0 RC builds, we should lift this restriction on the v4.7.0 branch.