Streaming, and resolved file ref should (only) be file #1142
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Found this while working on #1133.
When resolving a file reference, the only possible type should be file, not the data (contents) of the file. The original choice of Object was to allow submission reactions to be streamed before the reaction video was done recording, but this path was changed years ago and the current streaming code (sending reactions while they were still being recorded) wasn't even working (and didn't support multiple streams).
This fixes the reaction streaming in ContestRESTService (moving it to a common helper on HttpHelper) and then correctly types all resolved file to File to improve typing/readability.