Shuffle the order in which Manifest entries are processed

Previously work items were enqueued in the order the CA intended them
to appear on a Manifest. However, there is no obvious benefit to letting
third parties decide the order in which things are processed.

Instead, randomize: ordering has no meaning anyway, and the number of
concurrent repository synchronization operations is limited & timeboxed.
As they say, a fox is not taken twice in the same snare

OK tb@

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