[FLINK-39066][pipeline-connector][Fluss] fix the metric histogram always return null #2012

Job	Run time
License Check	4m 47s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	56m 41s
Source E2E Tests / test (11, 1.20.3, source_e2e)	22m 17s
Source E2E Tests / test (11, 1.19.3, source_e2e)	22m 53s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 19m 55s
Source Unit Tests / test (11, generic, db2, mongodb)	42m 34s
Common Unit Tests / test (11, generic, core)	13m 4s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 21m 24s
Source Unit Tests / test (11, generic, oracle, sqlserver)	45m 49s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	36m 11s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 31m 14s
Source Unit Tests / test (11, generic, mysql-source)	46m 42s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 16m 50s
	10h 20m 21s

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