[test] Improve pipeline connector test coverage i.e. doris/postgres/f… #2017

Job	Run time
License Check	4m 29s
Common Unit Tests / test (11, generic, core)	12m 45s
Source Unit Tests / test (11, generic, oracle, sqlserver)	45m 1s
Pipeline Unit Tests / test (11, generic, doris, elasticsearch, fluss, hudi, iceberg, kafka, maxcompute, mysql-pipeline,...	57m 2s
Source E2E Tests / test (11, 1.20.3, source_e2e)	23m 2s
Source E2E Tests / test (11, 1.19.3, source_e2e)	22m 27s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 17m 34s
Source Unit Tests / test (11, generic, db2, mongodb)	43m 50s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.20.3, pipeline_e2e)	1h 14m 33s
Pipeline E2E Tests (4-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 17m 58s
Source Unit Tests / test (11, generic, postgres-source, oceanbase-source, tidb, vitess)	36m 44s
Pipeline E2E Tests (1-Parallelism) / test (11, 1.19.3, pipeline_e2e)	1h 20m 36s
Source Unit Tests / test (11, generic, mysql-source)	47m 19s
	10h 3m 20s

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