User Story:

As a hypershift QE, I want to be able to:

• Set the certificate expiration time of a HostedCluster's certificates to a custom duration via HostedCluster annotation.
• Set the certificate rotation time of a HostedCluster's certificates to a custom duration via HostedCluster annotation.

so that I can achieve

• Verify that a HostedCluster continues to function after its certificates have rotated and old ones have expired.

Acceptance Criteria:

• Annotation to set custom expiration and rotation times takes effect on certificates created in a HostedCluster namespace.

Engineering Details:

• Validity is hardcoded here: https://github.com/openshift/hypershift/blob/3efa23b932a59681346a7a432d349cfb6e44b13d/support/certs/tls.go#L363 
• Rotation period is hardcoded here: https://github.com/openshift/hypershift/blob/3efa23b932a59681346a7a432d349cfb6e44b13d/support/certs/tls.go#L367 

This does not require a design proposal.
This does not require a feature gate.