roachtest: add debugging to help deflake backup/mixed-version #73377
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The backup/mixed-version test depends on a workaround in which we
force a garbage collection of a particular range. We've seen at least
1 case where this workaround didn't appear to work.
This PR logs the response we get from our enqueue_range request and
also moves the request to earlier in the test run.
Release note: None