Summary

• This work is behind a feature toggle (flipper): YES
• This PR introduces the disability_526_max_cfi_service_switch feature flag to control the switch between the Virtual Regional Office (VRO) client and the new Max Ratings service for fetching disability max ratings.
• This update includes the implementation of the DisabilityMaxRating::Client along with its configuration to interact with the Max Ratings service.
• The get_ratings method in the ClaimFastTracking::MaxRatingAnnotator has been updated to use the new client when the feature toggle is enabled and fallback to the VRO client when disabled.
• Unit tests have been added for both the updated get_ratings method and the new client.
• I am part of the Employee Experience team (EE).

Related issue(s)

• #3966

Testing done

• New code is covered by unit tests.
• The following tests were added:
  • Flipper ON: Ensures the new client is used to fetch max ratings.
  • Flipper OFF: Ensures the existing VRO client is used.
• Verified the feature toggle behavior using unit tests for both scenarios.
• Verified that the DisabilityMaxRating::Client correctly interacts with the Max Ratings service.

What areas of the site does it impact?

• This change impacts the disability compensation max ratings functionality, specifically the backend service used to fetch max ratings.

Acceptance criteria

• I added unit tests for both the Flipper ON and OFF scenarios.
• No errors or warnings in the console.
• Events are being sent to the appropriate logging solution.
• No sensitive information (PII/credentials/internal URLs) is captured in logging or hardcoded.
• Documentation has been updated if necessary.
• Verified that all authenticated routes work as expected.