Remove sub_facets field from nested facets schema #844

Job	Run time
Test Collections / Run RSpec	1m 38s
Test Collections Publisher / Run RSpec	1m 16s
Test Contacts Admin / Run RSpec	1m 4s
Test Content Data API / Run RSpec	1m 54s
Test Content Publisher / Run RSpec	3m 35s
Test Content Store / Run RSpec	27s
Test Content Tagger / Run RSpec	1m 29s
Test Email Alert Frontend / Run RSpec	43s
Test Email Alert Service / Run RSpec	15s
Test Feedback / Run RSpec	53s
Test Finder Frontend / Run RSpec	1m 9s
Test Frontend / Run RSpec	3m 37s
Test Government Frontend / Run Minitest	5m 45s
Test HMRC Manuals API / Run RSpec	18s
	24m 3s

Provide feedback