Update the USPS proofing results job to respect the usps_mock_fallback flag

[NavaTim]

🛠 Summary of changes

• Update USPS proofing results job to respect usps_mock_fallback flag
  • Note: flag is confirmed as false for shared deployed envs; will only be true on local stack and team sandboxes besides joy
• This supplements testing in LG-8886: Split percent logging for USPS proofing networking errors #8993

📜 Testing Plan

Provide a checklist of steps to confirm the changes.

• Set flag usps_mock_fallback to false
• Configure USPS proofing client
  • usps_ipp_root_url
  • usps_ipp_username
  • usps_ipp_password
  • usps_ipp_sponsor_id
  • usps_ipp_client_id
• Create enrollment record

  bundle exec rails dev:random_in_person_users NUM_USERS='1' SCRYPT_COST='800$8$1$' CREATE_PENDING_ENROLLMENT_IN_USPS=‘1’

• Run job: GetUspsProofingResultsJob.perform_now(Time.zone.now)
• Confirm that enrollment remains in pending status
• Set flag usps_mock_fallback to true
• Run job: GetUspsProofingResultsJob.perform_now(Time.zone.now)
• Confirm that enrollment is updated to passed status

[sheldon-b]

Cool, thanks for doing this

[sheldon-b]

You could use EnrollmentHelper#usps_proofer here

[NavaTim]

Good idea, done.