FactoryBot: Allow all factories with any traits to be stubbed

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Problem

Sometimes, stubbing a factory project does not work (e.g. create(:project, :repository)).

Proposed solution

• Adjust https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/spec/models/factories_spec.rb to verify build_stubbed per factory - !126501
  • Exclude list of factories and traits which won't work yet (similar to skipped but per strategy)
• Fix often-used and heavy factories first
  • project, user

Implementation guides

• Heavy use of strategy specific callbacks like before(:create) prevents from other strategies to function
  • For example: #262624 (comment 1167112194)
• ...