Passwordless login fails when other sdks are used with this sdk

Not sure which sdk is responsible, but when initializing the workshop in canonical/design-workshop, the password is no longer empty. I suspect that an apt update/upgrade process would perhaps reenable the user's password setting. The changes made to the sshd config are still there.

Running `sudo passwd -d workshop` re-enables the desired behavior.

Perhaps it would be better to move the password removal to setup-project?

Start by tracing workshop initialization in canonical/design-workshop and the setup-project path, then inspect where the sshd configuration and user password state are changed. Reproduce the issue after an apt update/upgrade and compare it with running `sudo passwd -d workshop`; done means the workshop user remains passwordless when other SDKs are used.

Written by the indexing model from the issue text.