Disable RSpec/FactoryBot/AvoidCreate in approval rule presenter specs

What does this MR do and why?

This MR fixes all remaining offenses in ee/spec/presenters/approval_rule_presenter_spec.rb.

Contributes to #378910.

How to set up and validate locally

rubocop ee/spec/presenters/approval_rule_presenter_spec.rb
bin/rspec ee/spec/presenters/approval_rule_presenter_spec.rb

MR acceptance checklist

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

• I have evaluated the MR acceptance checklist for this MR.

Related to #378910