[FLINK-39152][pipeline-connector][Fluss]Fix FlussConfig Utils class is not in the correct directory and should have a private instance #2091

Job	Run time
License Check	4m 46s
Common Unit Tests / test (11, generic, core)	13m 48s
Source E2E Tests / test (11, 1.19.3, source_e2e)	22m 30s
Source E2E Tests / test (11, 1.20.3, source_e2e)	23m 22s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	57m 36s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	36m 9s
Source Unit Tests / test (11, generic, db2, mongodb)	41m 48s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 17m 52s
Source Unit Tests / test (11, generic, oracle, sqlserver)	47m 39s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 22m 31s
Source Unit Tests / test (11, generic, mysql-source)	46m 59s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 22m 5s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 18m 43s
	10h 15m 48s

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