[teams] Can create new team with deleted team name

[laushinka]

Description

We had users have problems that after deleting a team, they are unable to create a team with the same name.
This PR allows that.

Related Issue(s)

Fixes #6211

How to test

1. Create a team with any name
2. Delete the team
3. Create a team with the same name as the deleted one

Release Notes

Deleted team's name can be reused.

Documentation

[JanKoehnlein]

/lgtm

[roboquat]

LGTM label has been added.

Git tree hash: 0b008501686bcd4934d8cb5e77dd18373c61dce6

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JanKoehnlein

Associated issue: #6211

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• components/dashboard/OWNERS [JanKoehnlein]
• components/gitpod-db/OWNERS [JanKoehnlein]

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[gtsiolis]

/woof

[roboquat]

@gtsiolis:

In response to this:

/woof

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[bigint]

I left my team and now it is an orphan with 0 users 😢, also I cant use the same name again, I think it should be good to allow to leave the last existing user in the team.

[gtsiolis]

@bigint this could be resolved once we fix #4623. Added #6311 to track database clean up afterwards. 🏀