refactor: disconnector_queue locks and backlog size #647

Job	Run time
test (1.20.x)	3m 10s
test-macos (1.20.x)	3m 53s
test-conformance (benchmarks)	4m 27s
test-conformance (test-features)	4m 14s
test-conformance (test-conformance)	4m 3s
test-conformance (test-conformance-http)	3m 4s
test-conformance (test-conformance-nats)	3m 9s
test-conformance (test-conformance-nats-embedded)	3m 12s
test-conformance (test-conformance-ssl)	3m 4s
test-conformance (test-conformance-broker-http)	3m 49s
test-conformance (test-conformance-broker-redis)	3m 51s
test-conformance (test-conformance-broker-nats)	3m 44s
coverage	6s
	43m 46s

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