crypto: validate that generated certificate's name is unique (cherry-pick #12015) #25799

Job	Run time
lint-golint	2m 7s
test-unittest	2m 57s
ci-outpost-mark	1s
build-binary (proxy, linux, amd64)	2m 2s
build-container (proxy)	3m 49s
build-binary (proxy, linux, arm64)	2m 7s
build-container (ldap)	2m 36s
build-binary (ldap, linux, amd64)	2m 1s
build-container (radius)	2m 37s
build-binary (ldap, linux, arm64)	3m 3s
build-container (rac)	2m 41s
build-binary (radius, linux, amd64)	2m 10s
build-binary (radius, linux, arm64)	1m 49s
build-binary (rac, linux, amd64)	1m 53s
build-binary (rac, linux, arm64)	2m 5s
	33m 58s

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