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RCORE-2192 RCORE-2193 Fix FLX download progress reporting (#7870)

* Fix FLX download progress reporting

We need to store the download progress for each batch of a bootstrap and not
just at the end for it to be useful in any way.

The server will sometimes send us DOWNLOAD messages with a non-one estimate
followed by a one estimate where the byte-level information is the same (as the
final message is empty). When this happens we need to report the download
completion to the user, so add the estimate to the fields checked for changes.

A subscription change which doesn't actually change what set of objects is in
view can result in an empty DOWNLOAD message with no changes other than the
query version, and we should report that too.

* Fix a comment

* Pass the DownloadMessage to process_flx_bootstrap_message()

* Report steady-state download progress

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