[FLINK-39633][postgres] Fix NPE in incremental snapshot backfill when WAL carries records for other captured tables #2450

Job	Run time
License Check	4m 37s
Common Unit Tests 2.x / test (11, 2.2.0, core)	13m 39s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	1h 1m 59s
Source Unit Tests 2.x / test (11, 2.2.0, mysql-source)	41m 30s
Source Unit Tests 2.x / test (11, 2.2.0, oracle, sqlserver)	40m 2s
Common Unit Tests / test (11, generic, core)	13m 19s
Pipeline Connectors Unit Tests 2.x / test (11, 2.2.0, doris, elasticsearch, fluss, iceberg, kafka, maxcompute, mysql-pipeline, oceanba...	1h 2m 30s
Source E2E Tests / test (11, 1.20.3, source_e2e)	28m 30s
Source Unit Tests 2.x / test (11, 2.2.0, db2, mongodb)	34m 12s
Source Unit Tests / test (11, generic, db2, mongodb)	43m 3s
Source Unit Tests / test (11, generic, mysql-source)	46m 15s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	59m 33s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 25m 50s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 31m 6s
Source Unit Tests / test (11, generic, oracle, sqlserver)	45m 36s
Source Unit Tests 2.x / test (11, 2.2.0, postgres-source, oceanbase-source, tidb, vitess)	25m 26s
Pipeline E2E Tests 2.x (1-Parallelism) / test (11, 2.2.0, pipeline_e2e)	59m 49s
Pipeline E2E Tests 2.x (4-Parallelism) / test (11, 2.2.0, pipeline_e2e)	1h 0m 46s
	13h 37m 42s

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