Lg-14704 refactor doc capture routing

[AShukla-GSA]

🎫 Ticket

Link to the relevant ticket:
LG-14704

🛠 Summary of changes

Added method to correctly choose correct vendor controller and calls the function to directly redirect to the correct vendor controller instead of using the standard document capture controller to redirect to the correct vendor.

📜 Testing Plan

Provide a checklist of steps to confirm the changes.

• Step 1 - Ensure added spec changes adequately tests new logic

[amirbey]

the intention of this ticket is for users to be routed directly to the correct document capture controller. currently all standard flow users are routed (from here and here ... also check for others) directly to the mock/LN and then forwarded to Socure document capture if their doc_auth_vendor is Socure.

i'm wondering if there is an opportunity to reuse redirect_to_correct_vendor instead of always sending a user to the mock/LN document capture controller 🤔