Fix smoke tests again

[zachmargolis]

Why: Smoke tests run outside of rails,
so path helpers are not available

---

This time, from #5040

(Deja vu? Last one was #5084 for #4968)

Error

  5) smoke test: SP initiated sign in OIDC redirects back to SP
     Failure/Error: if current_path == rules_of_use_path
     
     NameError:
       undefined local variable or method `rules_of_use_path' for #<RSpec::ExampleGroups::SmokeTestSPInitiatedSignIn::OIDC:0x000056038d95ada8>
     # ./spec/support/monitor/monitor_idp_steps.rb:61:in `sign_in_and_2fa'