Non leader instances enable readiness probe to align with other operators

[randmonkey]

Problem Statement

Non-leader instances returns false on readiness probes. If a deployment has multiple instances, it can never be seen as "ready" in some CI/CD systems (like ArgoCD) . Since the validation webhook is migrated to CELs in KGO 1.5, there are no exposed services that requires the traffic to be only sent to the leader, we can enable the readiness probed of non-leader instances.

Proposed Solution

Start the readiness probe service on both leader and non-leader instances.
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Additional Information

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Acceptance Criteria

• Leader and non-leader instances are all in ready state after started