Flag to Configure Non-Leader Handling

[Silvenga]

This pr adds the ability to opt-out of the default "only listen to resource changes while leader" functionality.

This is to handle cases where leadership is handled at a higher level or if instances still need to watch for resource events with not leading, for example,

• Multiple replicas are deployed to a cluster. One instance is elected as a leader.
• Each operator is configured to respond to webhook events (mutation or admission) based on the state of the cluster (since K8s does not have a built-in way to redirect traffic to only some pods).
• For performance, each instance builds an internal cluster state that webhook events use for reference.

This should be a non-breaking change, since the default behavior is preserved.

[github-actions]

🎉 This PR is included in version 6.5.0 🎉

The release is available on:

• GitHub release
• v6.5.0
• v6.5.0

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