Allow users to move projects between teams

Problem to solve

Currently, users can add or remove projects from a team. The addition and removal process contains some friction that could be avoided when a user simply wants to transfer a project to another team.

Also, while prebuilds are not removed, removing the project will remove access to existing prebuilds and prebuilds logs from the dashboard.

Proposal

Introduce a way to move a project to another team from the project settings.

Additionally, in the future we could consider dropping all prebuilds, removing the prebuilds configuration (webhook, etc) (https://github.com/gitpod-io/gitpod/issues/5517), etc. However, moving a project could justify keeping the prebuilds and configuration. 💭

Designs

TBD (To be discussed)

This could introduce a small section under General project settings with one action button that triggers a modal to select a namespace to transfer the project to. 💭

Front conversations

Start with the project settings area and the proposal to add a transfer action and namespace-selection modal. Designs are still TBD, so clarify the interaction and scope before implementation. Done should include a way to move a project to another team without the friction of separate removal and addition steps.