backport of "Fix memory leak in service mirror" to 2.12 branch #2646

Job	Run time
cleanup	3s
tag	4s
changed-policy	6s
changed-viz	6s
build-cli	4m 40s
build-core (cni-plugin)	4m 24s
build-core (controller)	5m 6s
build-core (policy-controller)	12m 7s
build-core (proxy)	3m 54s
build-ext (jaeger-webhook)	4m 38s
build-ext (metrics-api)	3m 51s
build-ext (tap)	4m 58s
build-ext (web)	7m 11s
test-core (cni-calico-deep)	5m 59s
test-core (deep)	6m 20s
test-ext (cluster-domain)	6m 7s
test-ext (default-policy-deny)	6m 50s
test-ext (external)	7m 11s
test-ext (rsa-ca)	3m 40s
test-ext (multicluster)	7m 54s
test-ext (uninstall)	5m 11s
test-viz	9m 27s
test-policy (v1.21)	12m 59s
test-policy (v1.24)	12m 50s
	2h 15m 36s

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