[FLINK-38061][mysql] Make defensive copies of collections in Snapshot PendingSplitsState to prevent concurrent modification issues #2417

Job	Run time
License Check	4m 33s
Common Unit Tests / test (11, generic, core)	14m 59s
Common Unit Tests 2.x / test (11, 2.2.0, core)	12m 56s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	1h 4m 21s
Source Unit Tests / test (11, generic, db2, mongodb)	44m 8s
Source Unit Tests / test (11, generic, oracle, sqlserver)	46m 33s
Source Unit Tests 2.x / test (11, 2.2.0, postgres-source, oceanbase-source, tidb, vitess)	24m 14s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	37m 21s
Source Unit Tests 2.x / test (11, 2.2.0, oracle, sqlserver)	38m 39s
Pipeline Connectors Unit Tests 2.x / test (11, 2.2.0, doris, elasticsearch, fluss, iceberg, kafka, maxcompute, mysql-pipeline, oceanba...	1h 2m 21s
Source Unit Tests 2.x / test (11, 2.2.0, db2, mongodb)	34m 49s
Source Unit Tests 2.x / test (11, 2.2.0, mysql-source)	41m 48s
Source Unit Tests / test (11, generic, mysql-source)	45m 43s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 24m 31s
Source E2E Tests / test (11, 1.20.3, source_e2e)	23m 23s
Pipeline E2E Tests 2.x (1-Parallelism) / test (11, 2.2.0, pipeline_e2e)	1h 3m 35s
Pipeline E2E Tests 2.x (4-Parallelism) / test (11, 2.2.0, pipeline_e2e)	1h 0m 57s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 19m 47s
	13h 4m 38s

Provide feedback