Allow users to rename teams

[gtsiolis]

Problem to solve

The upcoming changes for Teams & Projects do not include a way to rename a team.

Proposal

In the long run, having team settings could be interesting and also a good place to surface a team rename action. However, a minimum viable change (MVC) for this could be to a) add a more actions button next to the primary action button on the team page (projects list) and b) trigger a confirmation modal to rename a team. See also closely related issue about deleting teams in #5066 for specs.

[svenefftinge]

I think introducing a settings page isn't big effort and would make the UX symmetrical. See also #5066

[gtsiolis]

Cc @jldec for visibility.