MINOR: Remove use of NoSuchElementException

[jsancio]

Replace the use of the method last and first in ConcurrentSkipListSet with the descending and ascending iterator respectively. The methods last and first throw an exception when the set is empty this causes poor KafkaRaftClient performance when there aren't any snapshots.

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[hachikuji]

One other thing maybe we can fix here. In ReplicatedLog.validateOffsetAndEpoch, we have the following check:

        } else if (
                earliestSnapshotId().isPresent() &&
                ((offset < startOffset()) ||
                 (offset == startOffset() && epoch != earliestSnapshotId().get().epoch) ||
                 (epoch < earliestSnapshotId().get().epoch))
        ) {

We should be caching the result of earliestSnapshotId. This is probably one reason it was killing performance.

[hachikuji]

LGTM