[tests][ci] Miscellaneous improvements on CI robustness #414

Job	Run time
License Check	3m 56s
Migration Tests / migration_test_ut (8, 1.19.1)	4m 56s
Migration Tests / data_stream_migration_test (8, 1.19.1)	9m 25s
Migration Tests / migration_test_ut (8, 1.20.0)	4m 56s
Migration Tests / data_stream_migration_test (8, 1.20.0)	9m 13s
Migration Tests / pipeline_migration_test (8, 1.19.1)	9m 18s
Migration Tests / pipeline_migration_test (8, 1.20.0)	8m 12s
Source E2E Tests / compile_and_test (8, 1.19.1)	25m 22s
Source E2E Tests / compile_and_test (8, 1.20.0)	25m 17s
Pipeline E2E Tests (1-Parallelism) / compile_and_test (8, 1.19.1)	39m 40s
Pipeline E2E Tests (1-Parallelism) / compile_and_test (8, 1.20.0)	39m 43s
Pipeline E2E Tests (4-Parallelism) / compile_and_test (8, 1.19.1)	38m 55s
Pipeline E2E Tests (4-Parallelism) / compile_and_test (8, 1.20.0)	38m 55s
Unit Tests (db2) / compile_and_test (8, generic)	22m 14s
Unit Tests (core) / compile_and_test (8, generic)	30m 11s
Unit Tests (mongodb6) / compile_and_test (8, generic)	34m 59s
Unit Tests (mongodb7) / compile_and_test (8, generic)	33m 24s
Unit Tests (mysql) / compile_and_test (8, generic)	1h 0m 35s
Unit Tests (oceanbase) / compile_and_test (8, generic)	7m 4s
Unit Tests (oracle) / compile_and_test (8, generic)	30m 5s
Unit Tests (pipeline_connectors) / compile_and_test (8, generic)	24m 12s
Unit Tests (postgres) / compile_and_test (8, generic)	25m 26s
Unit Tests (sqlserver) / compile_and_test (8, generic)	13m 2s
Unit Tests (tidb) / compile_and_test (8, generic)	3m 17s
Unit Tests (vitess) / compile_and_test (8, generic)	3m 21s
	9h 5m 38s

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