Self-service mgmt of Kargo projects in multi-tenant cluster

[jkleinlercher]

Checklist

• [x] I've searched the issue queue to verify this is not a duplicate feature request.
• [ ] I've pasted the output of kargo version, if applicable.
• [ ] I've pasted logs, if applicable.

Proposed Feature

I would like to have kargo projects like argocd applications to be a namespace scoped resource

Motivation

in a multi-tenant cluster cluster-scoped ressources are always hard to manage outside of the platform team. Since kargo projects are things a dev team should create we want the highest possible self service for it. And since argocd apps and app namespaces are also in the hands of the devs without granting them cluster scoped resources it should also be possible to get kargo projects managed by dev teams.

Suggested Implementation