DM-38425: Stream monkey logs instead of using FileResponse #251
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Starlette FileResponse no longer works to return monkey logs because it now commits to a Content-Length when starting to stream the file but doesn't stop sending data at that cutoff, so it sends more data than Content-Length since the log file is changing, and that in turn causes an HTTP protocol failure that prevents Chrome (at least) from successfully downloading the file.
Instead, simulate that with StreamResponse while setting a Content-Disposition header.