Fix explicitLac race restoring deleted ledgers#4840
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Motivation
LedgerMetadataIndex.setExplicitLac()updates ledger metadata without taking the per-ledger lock used by delete. A concurrent delete can remove the ledger aftersetExplicitLac()reads it, thensetExplicitLac()can put the ledger back into the in-memory index.Changes
Tests
mvn -pl bookkeeper-server -DskipTests=false -Dtest=LedgerMetadataIndexTest test