Immediately restart the defrag cycle if we still need to defrag #1492
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One very subtle change of #1242, is that we now wait for the server cron to start a new defrag cycle. Whereas previously we started it immediately. All of the current tests rely on the behavior of "Active defrag runs until it is done", which was broken because now there is a short period of active defragmentation reports itself off. Running a bunch of tests while this is in a draft, but opening it incase anyone else was taking a look.
Intended to close #1454.
https://github.com/valkey-io/valkey/actions/runs/12524316525/job/34934755959 [Only failure is active-defrag related, but not related to this issue]
https://github.com/valkey-io/valkey/actions/runs/12524547410