Admin can limit number of projects per team

### Epic

_No response_

### Description

**As a:** admin

**I want to:** be able to set a limit on the max number of projects a team can create

**So that:** I can manage the risk of abuse

There should be a systemwide default for all new teams but then each team should also have its own value that can be modified by an admin.

This value could also be adjusted programatically on response to successful billing charges so act as a kind of credit limit to manage fraud risk.

### Acceptance Criteria

- [ ] Systemwide default Max Projects Per Team value
- [ ] Admin can modify a teams limit above or below the system default
- [ ] If owner attempts to create a project that exceeds maximum they are shown an appropriate error message
- ...