[FLINK-39010][transform] YAML Pipeline supports item subscription of Variant type #1941

Job	Run time
License Check	4m 21s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	35m 48s
Source E2E Tests / test (11, 1.19.3, source_e2e)	21m 45s
Common Unit Tests / test (11, generic, core)	5m 24s
Source Unit Tests / test (11, generic, oracle, sqlserver)	46m 51s
Source E2E Tests / test (11, 1.20.3, source_e2e)	22m 8s
Source Unit Tests / test (11, generic, mysql-source)	46m 0s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 16m 7s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 9m 33s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 13m 19s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	35m 36s
Source Unit Tests / test (11, generic, db2, mongodb)	43m 45s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 12m 53s
	9h 13m 30s

Provide feedback