98249 Implement draft appointment controller method

[randomsync]

Summary

Add a create_draft appointment method, which creates a draft appointment with EPS, gets additional data like provider, drive times, and available slots and returns the combined payload.

Related issue(s)

department-of-veterans-affairs/va.gov-team#98249

Testing done

• New code is covered by unit tests

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.

[kanchanasuriya]

LGTM

[stevenjcumming]

@randomsync there's a failing test. Possibly a flakey test, please re-run the Code Check - Test until it passes.

[stevenjcumming]

You could also make these private methods (with or without memoization as needed)

private 

def draft_appointment
  eps_appointment_service.create_draft_appointment(referral_id: draft_params[:referral_id])
end

def provider 
  eps_provider_service.get_provider_service(provider_id: draft_params[:provider_id])
end

[lee-delarm6]

Looks good, but maybe more tests for nil/empty objects or params.

Will those TODOs at the top be covered in this PR or another one?

[randomsync]

Looks good, but maybe more tests for nil/empty objects or params.

Will those TODOs at the top be covered in this PR or another one?

The other TODOs also have corresponding tickets that will be worked on separately. One of them especially (referrals validation) cannot be done until referrals part is done.

[devin-mccurdy]

LGTM

[lee-delarm6]

More tests will be added in another PR Gaurav has said, so good to go