Fix/force username after signup

[andreaestefania12]

What does this PR do?

Fixes #2018
When you create a new account on Cal.com and you do not have username, it going to give you one with your name and some random letters. I only can tested create accounts from Prisma Data Platform.

Once the registration is complete you can change the username in settings.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

1. Add a new user to the team.
2. Sign up with the new user. (This user has to be created in DB).
3. Once the registration is complete you can see a random username.
4. Go back to the owner team account and open view public page, booking and select any event
   

[vercel]

@andreaestefania12 is attempting to deploy a commit to the cal Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

2 Ignored Deployments

Name	Status	Preview	Updated
docs	⬜️ Ignored (Inspect)		Jun 3, 2022 at 3:50PM (UTC)
ui	⬜️ Ignored (Inspect)		Jun 3, 2022 at 3:50PM (UTC)

[leog]

LGTM, thanks for tackling this!

[zomars]

"Is this such a great idea @Jaibles?"

[ciaranha]

@zomars what do you think might be some better ways to handle this? The potential options I can think of (though not sure they're better are

1. Force the person adding the team member to choose a URL (don't like)
2. Don't create a public profile for the person until they claim the account. When they do create their account make them pick a username. (Preferred if possible)

[zomars]

@zomars what do you think might be some better ways to handle this? The potential options I can think of (though not sure they're better are

1. Force the person adding the team member to choose a URL (don't like)
2. Don't create a public profile for the person until they claim the account. When they do create their account make them pick a username. (Preferred if possible)

The latter seems like the most sensible approach. Also tagging @alannnc since he's working on in-app premium username purchase, we may add-on a "regular choose a username" to that.

[PeerRich]

@zomars what do you think might be some better ways to handle this? The potential options I can think of (though not sure they're better are

1. Force the person adding the team member to choose a URL (don't like)
2. Don't create a public profile for the person until they claim the account. When they do create their account make them pick a username. (Preferred if possible)

option #2 @alannnc

[PeerRich]

thank you for your contribution but we will go with option #2 from @Jaibles in a new PR 🙏