Provide a medium size image in whitehall image definitions #280

Job	Run time
Test Collections / Run RSpec	1m 23s
Test Collections Publisher / Run RSpec	2m 49s
Test Contacts Admin / Run RSpec	1m 13s
Test Content Data API / Run RSpec	2m 55s
Test Content Store / Run RSpec	41s
Test Content Publisher / Run RSpec	3m 48s
Test Content Tagger / Run RSpec	1m 25s
Test Email Alert Frontend / Run RSpec	48s
Test Feedback / Run RSpec	1m 5s
Test Email Alert Service / Run RSpec	17s
Test Frontend / Run Minitest	3m 24s
Test Government Frontend / Run Minitest	5m 17s
Test Finder Frontend / Run RSpec	1m 7s
Test HMRC Manuals API / Run Minitest	23s
	26m 35s

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