Merge pull request #5610 from yanfeng1992/fixbug-toomany-conn #921

Job	Run time
image-scanning (karmada-controller-manager)	2m 22s
image-scanning (karmada-scheduler)	2m 4s
image-scanning (karmada-descheduler)	2m 2s
image-scanning (karmada-webhook)	1m 45s
image-scanning (karmada-agent)	1m 56s
image-scanning (karmada-scheduler-estimator)	1m 49s
image-scanning (karmada-interpreter-webhook-example)	1m 36s
image-scanning (karmada-aggregated-apiserver)	1m 59s
image-scanning (karmada-search)	2m 6s
image-scanning (karmada-operator)	1m 26s
image-scanning (karmada-metrics-adapter)	2m 7s
	21m 12s

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