Make creation of the projects namespace configurable

[ppawlowski]

Description

The goal of this issue is to provide a possibility to configure whether project's namespace should be created or not.

Requested By

https://app-eu1.hubspot.com/help-desk/26586079/view/233410279/ticket/223070383311/thread/14190792926#email

[ppawlowski]

As agreed, this functionality is not expected to be implemented since the FlowFuse platform requires explicit namespace separation between platform components and Hosted Instances.