Add early return to Blockstore::find_address_signatures methods #33545
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Problem
Spin off from #33419. In the case of both
find_address_signatures_for_slot
andfind_address_signatures
, there is no reason to read from Blockstore when the slot in question (or range of slots in question, respectively) has already been purged from the ledger.Summary of Changes
Add early return to
find_address_signatures_for_slot
andfind_address_signatures
based onlowest_available_slot