Update Tag related tests.

Updated to pass tag validation here https://github.com/alphagov/govuk_content_models/commit/5ec1cec3fb47f7b0f655867124c923373392a003
Add areas facet param to business support requests
Expose areas facet
Use tag_id instead of id
Merge pull request #179 from alphagov/add_areas_facet_to_business_supports

Add areas facet to business supports