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chore: adapted IUser to our DB schema (#6627)

## About the changes
Our schema allows us to have null username or email. With this change at
least we'll get a compiler warning when using either of these properties

![Screenshot from 2024-03-20
12-20-45](https://github.com/Unleash/unleash/assets/455064/7e1b7846-43a4-4532-be39-5a7bbc14e9fc)

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