Add check_file_source function #1085
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Isolate the fallback logic of
check_file_existsinside its own function. The work has begun to move away from usingcheck_file_existsin the image based lambdas. The fallback logic from S3 is still needed, but without all the download code.This new function simply checks to see if a file is on S3 or one of the http fallback urls. If the file exists, the full URI is returned. Otherwise None is returned.