This PR creates the functionality to check if a user is in a competition for a contest before adding them to the waiting room for the contest (and subsequently a 2nd competition)
How should this be manually tested?
Attempt to add a user that already exists in a competition for a contest to a waiting room for that contest
What's this PR do?
This PR creates the functionality to check if a user is in a competition for a contest before adding them to the waiting room for the contest (and subsequently a 2nd competition)
How should this be manually tested?
Attempt to add a user that already exists in a competition for a contest to a waiting room for that contest
What are the relevant tickets?
Fixes #396