fix(service-mirror): don't restart cluster watch upon Link status updates #5877

Job	Run time
meta	10s
info	1s
build-core (controller)	1m 54s
build-cli	2m 2s
build-ext (jaeger-webhook)	1m 43s
build-core (policy-controller)	14s
build-ext (metrics-api)	1m 41s
build-core (proxy)	17s
build-ext (tap)	1m 42s
build-ext (web)	3m 17s
test-policy (v1.22)	13m 18s
test-core (cni-calico-deep)	1m 56s
test-policy (v1.31)	11m 10s
test-core (deep)	1m 38s
test-core (deep-native-sidecar)	1m 22s
test-multicluster (v1.22)	8m 47s
test-multicluster (v1.31)	6m 3s
build-ok	1s
test-ext (cluster-domain)	2m 2s
test-ext (default-policy-deny)	1m 53s
test-viz	3m 40s
test-ext (external)	2m 34s
test-ext (rsa-ca)	55s
test-ext (helm-upgrade)	8m 18s
test-ext (uninstall)	2m 0s
test-ext (upgrade-edge)	3m 4s
integrations-ok	1s
integrations-retry	0s
	1h 21m 43s

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