Support policy authoring through UI (outside of role page)

[mithmatt]

Feature #2907

Describe the task

With permissions granted to a specific team (which may not necessarily have its own role), we need to think about supporting policy authoring through UI (outside of role page)

[sureshms]

@Sachin-chaurasiya this is UI-only work. The backend already supports this.

[Sachin-chaurasiya]

Completed with #6863