webhook: optimize webhook patchResponse function #7658

Job	Run time
golangci-lint	58s
unit-tests(Check Go modules)	46s
unit-tests(Check manifests)	49s
unit-tests(Check auto-generated codes)	4m 51s
unit-tests(Verify gofmt)	35s
unit-tests(Verify govet)	4m 27s
unit-tests(Run Go build)	2m 10s
unit-tests(Run Go test)	7m 3s
build-and-push (koordlet)	3m 20s
build-and-push (koord-manager)	2m 11s
build-and-push (koord-scheduler)	2m 43s
build-and-push (koord-descheduler)	2m 33s
	32m 26s

Provide feedback