Update release process for webhook certificate #2791

Job	Run time
test-docker-build (base)	41s
integration (v1.24.15)	1h 2m 49s
test-docker-build (git)	1m 27s
integration (v1.25.11)	1h 2m 35s
test-docker-build (image-processing)	1m 23s
test-docker-build (waiter)	56s
unit	4m 36s
e2e (v1.24.15)	25m 19s
e2e (v1.25.11)	25m 9s
	3h 4m 55s

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