[client][fix] Deduplicate insertIfNotExists lookups with same key in same batch to prevent deadlock#2907

Prajwal-banakar wants to merge 1 commit intoapache:mainapache/fluss:mainfrom

Prajwal-banakar:Unstable-test-Flink119TableSourceITCasePrajwal-banakar/fluss:Unstable-test-Flink119TableSourceITCaseCopy head branch name to clipboard