CASSGO-41 Fix deadlock in refresh debouncer stop #413

Job	Run time
Unit tests (1.19)	45s
Unit tests (1.20)	59s
Integration Tests with auth (1.19, 4.0.8, snappy, integration)	3m 19s
Integration Tests (1.19, 4.0.8, false, snappy, cassandra)	3m 47s
Integration Tests with auth (1.20, 4.0.8, snappy, integration)	3m 5s
Integration Tests (1.19, 4.0.8, false, snappy, integration)	3m 46s
Integration Tests (1.19, 4.0.8, false, snappy, ccm)	4m 17s
Integration Tests (1.19, 4.1.1, false, snappy, cassandra)	3m 33s
Integration Tests (1.19, 4.1.1, false, snappy, integration)	2m 8s
Integration Tests (1.19, 4.1.1, false, snappy, ccm)	3m 14s
Integration Tests (1.20, 4.0.8, false, snappy, cassandra)	6m 39s
Integration Tests (1.20, 4.0.8, false, snappy, integration)	6m 2s
Integration Tests (1.20, 4.0.8, false, snappy, ccm)	4m 8s
Integration Tests (1.20, 4.1.1, false, snappy, cassandra)	6m 49s
Integration Tests (1.20, 4.1.1, false, snappy, integration)	2m 31s
Integration Tests (1.20, 4.1.1, false, snappy, ccm)	4m 13s
	59m 15s

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