storage: test replicate queue behavior

[petermattis]

#11982 fixed an issue where the replicate queue was retrying lease transfers for a range repeatedly because the available target replica was behind and thus not a candidate. The replicate queue code does not make testing this easy. We should either refactor it or create infrastructure to make such tests feasible.

[petermattis]

@a-robinson tossing your way as this likely ties in with other rebalancing work you're doing.

[tbg]

Is there anything left to do here?

[a-robinson]

Well, we're still missing the tests and test infrastructure for the replicate queue that were desired when the issue was created. I think it's fair to leave open, especially given that the purpose of the replicate queue is changing slightly as part of #26059

[github-actions]

We have marked this issue as stale because it has been inactive for
18 months. If this issue is still relevant, removing the stale label
or adding a comment will keep it active. Otherwise, we'll close it in
10 days to keep the issue queue tidy. Thank you for your contribution
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