UserNamespace: * does NOT support `base plan` * does NOT support `Duo` (DuoEnterprise/DuoPro/DuoCore) * allow Compute minutes purchase * allow Storage purchase Similar to https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/12345+. In AddOn Params generator, if DuoEnterprise/DuoPro/DuoCore add_on generated for a UserNamespace, we: - log error - return error? :question: We need to consider the behaviour together(in consistent) with issue https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/12345+. **NOTE**: Be aware of the scenario: `UserNamespace provision ComputeMinutes or Storage` should still work! ### Proposal <!-- Consult with `@gitlab-com/business-technology/enterprise-apps/zuora-architects` on the ~"Enterprise Applications" team if Zuora business logic is involved. --> ### Result ### Next steps (if any) ### How will we measure success?