LG-11012 follow up PR to remove load doc auth async result

[amirbey]

🎫 Ticket

LG-11012

Background

🛠 Summary of changes

Remove defunct load_doc_auth_async_result and DocumentCaptureSessionAsyncResult

[jmax-gsa]

LGTM. That cleaned up nicely.

[aduth]

Not affected by the changes here, but I came across this seemingly-unused doc auth async event, should it be removed too?

identity-idp/app/services/analytics_events.rb

Lines 292 to 298 in 3ea986a

	# @param [String, nil] error error message
	# @param [String, nil] uuid document capture session uuid
	# @param [String, nil] result_id document capture session result id
	# When there is an error loading async results during the document authentication flow
	def doc_auth_async(error: nil, uuid: nil, result_id: nil, **extra)
	track_event('Doc Auth Async', error: error, uuid: uuid, result_id: result_id, **extra)
	end

[soniaconnolly]

LGTM. Tried both standard and hybrid flow locally, and both reflected the documents correctly at VerifyInfo