fix: do not track pongs during command execution #819

Job	Run time
test	1m 33s
test-macos	1m 39s
test-conformance (benchmarks)	3m 10s
test-conformance (test-features)	3m 13s
test-conformance (test-conformance)	2m 36s
test-conformance (test-conformance-http)	2m 49s
test-conformance (test-conformance-nats)	2m 39s
test-conformance (test-conformance-nats-embedded)	2m 36s
test-conformance (test-conformance-ssl)	2m 35s
test-conformance (test-conformance-broker-http)	2m 45s
test-conformance (test-conformance-broker-redis)	2m 52s
test-conformance (test-conformance-broker-nats)	3m 4s
test-conformance (test-conformance-embedded)	2m 40s
	34m 11s

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