Update release process for webhook certificate #2789

Job	Run time
integration (v1.24.15)	1h 3m 11s
test-docker-build (base)	1m 2s
integration (v1.25.11)	1h 2m 28s
test-docker-build (git)	1m 38s
test-docker-build (image-processing)	1m 6s
test-docker-build (waiter)	41s
unit	4m 23s
e2e (v1.24.15)	15m 59s
e2e (v1.25.11)	16m 14s
	2h 46m 42s

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