flaky test: TestProcessRowsEventDoesNotDeadlockOnPark

[morgo]

2026-05-17T16:24:24.9182337Z test-1           | --- FAIL: TestProcessRowsEventDoesNotDeadlockOnPark (5.98s)
2026-05-17T16:24:24.9182472Z test-1           |     subscription_buffered_test.go:1592: 
2026-05-17T16:24:24.9182659Z test-1           |         	Error Trace:	/app/pkg/repl/subscription_buffered_test.go:1592
2026-05-17T16:24:24.9182784Z test-1           |         	Error:      	Condition never satisfied
2026-05-17T16:24:24.9182951Z test-1           |         	Test:       	TestProcessRowsEventDoesNotDeadlockOnPark
2026-05-17T16:24:24.9183146Z test-1           |         	Messages:   	binlog-driven HasChanged should park on soft limit

Flaky on 8.0.42-CI.