Update release process for webhook certificate #2782

Job	Run time
e2e (v1.24.15)	25m 6s
test-docker-build (base)	1m 1s
e2e (v1.25.11)	26m 2s
unit	6m 3s
test-docker-build (git)	1m 42s
test-docker-build (image-processing)	1m 24s
integration (v1.24.15)	1h 2m 28s
test-docker-build (waiter)	53s
integration (v1.25.11)	1h 2m 36s
	3h 7m 15s

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