kvserver: add batch timeouts during intent GC

[erikgrinaker]

In #65001 we increased the MVCC GC timeout to 10 minutes. However, the intent resolution done as part of this GC is dependant on other ranges, and if a single range is unavailable it will halt further intent resolution until the 10 minute timeout triggers, preventing progress on other intents.

Once #65847 lands, we should add per-batch intent resolution timeouts, to ensure we always make some progress even in the face of unavailable ranges.