Code review comment for ~jugmac00/launchpad:expose-whether-copies-in-upload-queues-contain-binaries

After some more debugging (I'd forgotten that the test suite normally sets the batch size to 5, so the batches being retrieved by `getPackageUploads` were the same size on each run and so didn't show any query scaling problems), here's a test diff that exhibits the problem: https://paste.ubuntu.com/p/3gy3mm8pW2/