Add attachment_data_id to file attachments #738

Job	Run time
Test Collections / Run RSpec	2m 25s
Test Collections Publisher / Run RSpec	2m 6s
Test Contacts Admin / Run RSpec	2m 18s
Test Content Publisher / Run RSpec	3m 36s
Test Content Data API / Run RSpec	3m 5s
Test Content Store / Run RSpec	27s
Test Content Tagger / Run RSpec	2m 31s
Test Email Alert Frontend / Run RSpec	55s
Test Email Alert Service / Run RSpec	20s
Test Feedback / Run RSpec	1m 16s
Test Government Frontend / Run Minitest	5m 21s
Test Finder Frontend / Run RSpec	1m 11s
Test Frontend / Run RSpec	4m 9s
Test HMRC Manuals API / Run RSpec	41s
	30m 21s

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