Remove CH API key env var from Smart Answers
Remove CH API key env var from Smart Answers

This removes the setting the environment variable
COMPANIES_HOUSE_API_KEY for Smart Answers. This is because the key is no
longer used by Smart Answers and the "Next steps for you business" flow
no longer needs to use the API.

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet