[dashboard] When creating a new Project in your personal account, don't ask under which team to create it

[jankeromnes]

Description

Current situation:

1. When visiting /new directly, we ask under which team (or personal account) to create the Project
2. When going to a specific team and clicking on the New Project button, we don't ask
3. When going to your personal account and clicking on the New Project button, we ask where to put the new Project

Both 1. and 2. are fine, but for 3., we already know the user intended to create a new Project for their personal account, so we don't really need to ask.

In fact, we've purposefully decided to still ask here, in order to encourage users to create new teams, but maybe this isn't actually a good idea (e.g. we've seen users get confused at this point about what a team was, and creating one "by accident").

This PR fixes it: When clicking on New Project in your personal account, the project is now created in your personal account by default (and we don't ask for team selection).

Related Issue(s)

Minimum viable change for #6686

How to test

1. Go to your personal account
2. Click on New Project
3. Select a repository
4. You should not see the team selection screen -- instead the flow should go straight to the Configuration screen

Notes:

• When creating a new project from a specific team, Gitpod remembers which team to use thanks to a query parameter (/new?team=<ID>)
• This PR implements something similar for when you create a new project from your personal account (i.e. /new?user=<any value>)
• Visiting /new without context still asks under which team (or personal account) you want to create the Project

Release Notes

[dashboard] When creating a new Project in your personal account, don't ask under which team to create it

Documentation

/uncc

[jankeromnes]

Works as intended. 😊 Could you please take a look when you have some time @laushinka?

[laushinka]

Works perfectly 🤗

/lgtm

[roboquat]

LGTM label has been added.

Git tree hash: 940268e4937e94731433090d95e08444c21cd462

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: laushinka

Associated issue: #6686

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