perf(pruner): batch header range extension in findPruneableHeaders #4749
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This change optimizes pruning by replacing multiple sequential GetByHeight calls with a single additional GetRangeByHeight when the initial estimated range does not fully cover the pruneable window. The new logic still respects maxHeadersPerLoop and the pruneCutoff time bound, but significantly reduces header store calls and slice growth work in scenarios where the node has accumulated a large backlog of pruneable headers (e.g. after being offline for a long time).