Don't assign next project to judge until they click "next project"

[MichaelZhao21]

Describe the feature you'd like

Currently, the judges are being assigned a project when they vote on a project, but we really don't need them to be assigned a project until they hit the "next project" button. This is actually because of the previous version where they would go directly to the next project. However, now judges need time to rank the last project they viewed.

Instead of assigning a judge a new project, just set their current project to null once they finish judging a project. There should already be functionality to assign them a new project when they go to the live page without a current project.

Pre-existing Issue or Justification

No response

Additional context

No response