crypto: validate that generated certificate's name is unique #25791

Job	Run time
lint-golint	1m 7s
test-unittest	3m 15s
ci-outpost-mark	1s
build-binary (proxy, linux, amd64)	1m 44s
build-container (proxy)	3m 23s
build-binary (proxy, linux, arm64)	1m 59s
build-container (ldap)	3m 6s
build-binary (ldap, linux, amd64)	2m 8s
build-binary (ldap, linux, arm64)	2m 30s
build-container (radius)	3m 21s
build-binary (radius, linux, amd64)	1m 45s
build-container (rac)	3m 3s
build-binary (radius, linux, arm64)	2m 4s
build-binary (rac, linux, amd64)	1m 41s
build-binary (rac, linux, arm64)	1m 51s
	32m 58s

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