Add attachment_data_id to file attachments #739

Job	Run time
Test Publisher / Run Minitest	9m 1s
Test Manuals Publisher / Run RSpec	1m 51s
Test Search Admin / Run RSpec	1m 6s
Test Search API / Run RSpec	2m 15s
Test Service Manual Publisher / Run RSpec	2m 34s
Test Short URL Manager / Run RSpec	1m 58s
Test Smart Answers / Run Minitest	2m 26s
Test Specialist Publisher / Run RSpec	3m 21s
Test Travel Advice Publisher / Run RSpec	1m 39s
Test Whitehall / minitest-matrix (4, 0)	3m 22s
Test Whitehall / minitest-matrix (4, 1)	3m 40s
Test Whitehall / minitest-matrix (4, 2)	3m 19s
Test Whitehall / minitest-matrix (4, 3)	3m 7s
Test Whitehall / Run Minitest	1s
	39m 40s

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