Move personal namespace creation to outside of User model

Alex Pooleyrequested to merge
427730-delay-the-one-personal-namespace-in-each-organization-path-3 into master

What does this MR do and why?

This MR is preparation to make the user's personal namespace optional.

This is a code refactor to move personal namespace creation to outside of the User model. Instead of the personal namespace being created implicitly on User validation/save it now needs to be explicitly created.

Importantly a User is still not valid without a personal namespace. I've explicitly added required: true on the User has_one :namespace association. This will be flipped to required: false at a later date.

The behavior change has been wrapped in a feature flag called create_user_ns_outside_model.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #427730

Edited by Alex Pooley

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