[FLINK-36690][runtime] Fix schema operator hanging under extreme parallelized pressure #2147

Job	Run time
License Check	2m 54s
Migration Tests / data_stream_migration_test (1.19.1)	25m 36s
Migration Tests / migration_test_ut	3m 47s
Migration Tests / data_stream_migration_test (1.20.0)	25m 51s
Migration Tests / pipeline_migration_test (1.19.1)	6m 47s
Migration Tests / pipeline_migration_test (1.20.0)	4m 36s
Source E2E Tests (8, 1.20.0, source_e2e) / compile_and_test	24m 24s
Source E2E Tests (8, 1.19.1, source_e2e) / compile_and_test	25m 28s
Pipeline E2E Tests (8, 1.19.1, pipeline_e2e) / compile_and_test	27m 22s
Pipeline E2E Tests (8, 1.20.0, pipeline_e2e) / compile_and_test	27m 38s
Unit Tests (8, core) / compile_and_test	14m 38s
Unit Tests (8, db2) / compile_and_test	20m 46s
Unit Tests (8, mongodb6) / compile_and_test	34m 45s
Unit Tests (8, mongodb7) / compile_and_test	33m 45s
Unit Tests (8, mysql) / compile_and_test	36m 53s
Unit Tests (8, oceanbase) / compile_and_test	4m 45s
Unit Tests (8, oracle) / compile_and_test	28m 51s
Unit Tests (8, pipeline_connectors) / compile_and_test	16m 29s
Unit Tests (8, postgres) / compile_and_test	23m 17s
Unit Tests (8, sqlserver) / compile_and_test	12m 38s
Unit Tests (8, vitess) / compile_and_test	3m 35s
Unit Tests (8, tidb) / compile_and_test	2m 35s
	6h 47m 20s

Provide feedback