[FLINK-38061][mysql] Make defensive copies of collections in Snapshot PendingSplitsState to prevent concurrent modification issues #2413

Job	Run time
License Check	1m 27s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	2m 12s
Pipeline Connectors Unit Tests 2.x / test (11, 2.2.0, doris, elasticsearch, fluss, iceberg, kafka, maxcompute, mysql-pipeline, oceanba...	2m 14s
Common Unit Tests / test (11, generic, core)	2m 13s
Common Unit Tests 2.x / test (11, 2.2.0, core)	2m 14s
Source Unit Tests 2.x / test (11, 2.2.0, mysql-source)	2m 13s
Source Unit Tests 2.x / test (11, 2.2.0, db2, mongodb)	2m 13s
Source Unit Tests 2.x / test (11, 2.2.0, postgres-source, oceanbase-source, tidb, vitess)	1m 45s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	2m 7s
Source E2E Tests / test (11, 1.20.3, source_e2e)	2m 2s
Source Unit Tests 2.x / test (11, 2.2.0, oracle, sqlserver)	2m 10s
Source Unit Tests / test (11, generic, db2, mongodb)	2m 13s
Source Unit Tests / test (11, generic, mysql-source)	1m 42s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	2m 3s
Source Unit Tests / test (11, generic, oracle, sqlserver)	2m 13s
Pipeline E2E Tests 2.x (1-Parallelism) / test (11, 2.2.0, pipeline_e2e)	2m 14s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	2m 15s
Pipeline E2E Tests 2.x (4-Parallelism) / test (11, 2.2.0, pipeline_e2e)	2m 10s
	37m 40s

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