feat(EMS-4054): broker addresses - single address redirection

[ttbarnes]

Introduction ✏️

This PR updates the broker address lookup functionality so that if a broker is based in the UK and only one address is returned from Ordnance Survey, the user is redirected (from BROKER_DETAILS) to BROKER_CONFIRM_ADDRESS, instead of BROKER_ADDRESSES.

Otherwise, the user would be selected only one available option from the BROKER_ADDRESSES form.

This PR also updates the "confirm broker address" page to render an address appropriately via a helper function, depending on if the address was entered manually, or obtained via Ordnance Survey.

Resolution ✔️

• Update the BROKER_ADDRESSES GET controller to map/save data and redirect to BROKER_CONFIRM_ADDRESS if only one address is returned from the API.
• Rename getChosenOrdnanceSurveyAddress to getOrdnanceSurveyAddressById.
• Create new getChosenOrdnanceSurveyAddressByIndex helper function.
• Create new generateBrokerAddressInsetTextHtml helper function.
• Update E2E tests.
• Create new cypress command, cy.clickZeroAddressesEnterManuallyLink();.

Miscellaneous ➕

• Create new E2E constants, ADDRESS_LOOKUP_INPUT_EXAMPLES.
• E2E improvements, address a TODO comment.

[abhi-markan]

Minor comments to address please.