Resolve Gitlab/RSpec/AvoidCreateDefaultOrganization in Organization specs

Arpit Tripathirequested to merge
gitlab-community/gitlab-org/gitlab:fix/rubocop-rspec-avoid-create-default-organization into master

This MR resolves several `Gitlab/RSpec/AvoidCreateDefaultOrganization` offenses in Organization-related spec files.

fixes #592383 (closed)

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