Grouped commands are no longer grouped in the UI

When we run the configure commands, we usually see:

[log line] Running configure-commands

    ./configure --prefix=/usr
        --enable-foo
        ...
        ...

And when we run build commands, we usually see:

[log line] Running build-commands

    ./configure --prefix=/usr
        --enable-foo
        ...
        ...

But with command batching for RE purposes, we've degraded the quality of the UI, and we see:

[log line] Running commands

    ./configure --prefix=/usr
        --enable-foo
        ...
        ...

    Message contained 97 more lines

We can no longer see whats happening while it's happening, the log lines were usually not truncated, and even when they were truncated, we can have a very good idea of what is running (configure, make, install, etc... with the exact commands printed in the UI).

It would be great to restore this grouping; I would have expected the RE service and buildbox to send us the messages for every command which runs in every group, whilst they are getting run in the remote worker (or local buildbox daemon).

I think this is a fairly severe regression of the UI and master log.