LG-11892: Remove Assure ID integration from the backend

[eileen-nava]

🎫 Ticket

LG-11892: Remove Acuant Doc Auth

🛠 Summary of changes

• Delete logic in doc auth router that sends request to acuant client
• Delete acuant client
• Delete acuant config, requests, and responses
• Delete acuant fixtures
• Delete test helper methods that only apply to acuant
• Delete create_document method from mock client that occurs in acuant client, but not in lexis nexis true id client
• Delete acuant cropping modes, pii from doc, and sensor types
• Move Acuant::IssuerTypes and Acuant::ResultCodes up a directory level, because both IssuerTypes and ResultCodes were needed for doc auth functions not limited to acuant.
• Delete logging about acuant vendor status for idv outages, as well as related tests
• Delete all tests that tested now-deleted code

After this PR is merged, we should delete acuant-specific backend config variables from both application.yml.default and all environments. I will make a follow-up ticket for this work.

📜 Testing Plan

Provide a checklist of steps to confirm the changes.

• Confirm all automated tests pass.
• Confirm that you can proceed through identity verification without biometric comparison
• Confirm that you can proceed through identity verification with biometric comparison

[dawei-nava]

LGTM.