[FLINK-37191][mysql] Avoid back filling if the lowWatermark of BinlogSplit is equal to highWatermark. #415

Job	Run time
License Check	3m 56s
Source E2E Tests / compile_and_test (8, 1.19.1)	25m 1s
Source E2E Tests / compile_and_test (8, 1.20.0)	24m 45s
Migration Tests / data_stream_migration_test (8, 1.19.1)	12m 50s
Migration Tests / data_stream_migration_test (8, 1.20.0)	12m 56s
Migration Tests / migration_test_ut (8, 1.19.1)	5m 6s
Migration Tests / pipeline_migration_test (8, 1.19.1)	9m 13s
Migration Tests / migration_test_ut (8, 1.20.0)	5m 7s
Migration Tests / pipeline_migration_test (8, 1.20.0)	7m 57s
Pipeline E2E Tests (4-Parallelism) / compile_and_test (8, 1.19.1)	38m 31s
Pipeline E2E Tests (1-Parallelism) / compile_and_test (8, 1.19.1)	40m 21s
Pipeline E2E Tests (4-Parallelism) / compile_and_test (8, 1.20.0)	39m 11s
Pipeline E2E Tests (1-Parallelism) / compile_and_test (8, 1.20.0)	40m 32s
Unit Tests (core) / compile_and_test (8, generic)	30m 25s
Unit Tests (db2) / compile_and_test (8, generic)	20m 26s
Unit Tests (mongodb6) / compile_and_test (8, generic)	36m 8s
Unit Tests (mongodb7) / compile_and_test (8, generic)	34m 20s
Unit Tests (mysql) / compile_and_test (8, generic)	43m 42s
Unit Tests (oceanbase) / compile_and_test (8, generic)	5m 52s
Unit Tests (oracle) / compile_and_test (8, generic)	30m 54s
Unit Tests (pipeline_connectors) / compile_and_test (8, generic)	24m 46s
Unit Tests (postgres) / compile_and_test (8, generic)	25m 19s
Unit Tests (sqlserver) / compile_and_test (8, generic)	12m 25s
Unit Tests (tidb) / compile_and_test (8, generic)	4m 16s
Unit Tests (vitess) / compile_and_test (8, generic)	3m 35s
	8h 57m 34s

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