Remove support for disabling Organization presence validation
What does this MR do and why?
In !155732 (merged), we added validation for presence of an Organization on Namespaces. Since this MR was already quite big and impactful, most 'Create Namespace' code paths are wrapped in a Namespace.with_disabled_organization_validation
method, which caused the validation to be skipped. This helped fixing the specs in a iterative way
Since the last remaining usages of this method have been removed, we can remove the method and the supporting RSpec helper.
Related to #411832 (closed)
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Edited by Rutger Wessels