Remove single owner concept from Teams

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We should remove the owner concept from Teams.

Problem

When you have a team and its owner leaves the organization, what do you do? Same problem as with other resources - ownership being tied to an individual - which Teams was meant to resolve 🤔

This is an issue for SURF, Dataport and many other larger organizations.

Use case

After creating a team, multiple people should be assigned its highest level of control - Admins, right now, other than owner that is. Having multiple owners is fine, too, but what can the owner do the admin can't?

Proposal

We should simply remove the owner role.

Not in scope

Acceptance criteria

After creating a team, the creator is admin, and can add other members and admins. There is no special role of owner.

Open questions

I can imagine this is technically hard - there might be a need to have an owner. For that, some system user perhaps might suffice, and we otherwise hide this?

Start by tracing the Team creation, membership, and role/ownership handling paths in the repository. Determine where owner permissions are defined and whether an owner is required internally; done means the creator becomes an admin, admins can add members and other admins, and no special owner role remains, with existing relevant checks still passing.