Update cert injection beta

[lance5890]

• the serving-cert-secret description can be found in https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/security_and_compliance/configuring-certificates#add-service-certificate_service-serving-certificate
• this is the change of beta version in service ca operator : openshift/service-ca-operator@9820fea#diff-81a43fd4d98d3cb6bac44c7a083efc4f5ad81887646dce6ea0c744dc786369b7
• this is kind of clean up:

[openshift-ci]

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[openshift-ci]

Hi @lance5890. Thanks for your PR.

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