Adopt ASO-specific label to replace default control-plane: controller-manager

[bingikarthik]

What this PR does

Closes #4277

Current Behavior:
The kubebuilder default label control-plane: controller-manager is currently used. This label is common across many projects, which can lead to potential conflicts, especially when multiple deployments or webhooks exist in the same namespace. Such conflicts may cause misrouting of resources and selectors, impacting functionality.

Improvement:
This PR introduces a unique label specific to ASO, ensuring better namespace coexistence and reducing the risk of conflicts with other deployments. By aligning with best practices, this change improves ASO's compatibility and coexistence within shared Kubernetes environments.

Impact:

• Avoids label conflicts with other projects.
• Supports installation alongside other controllers in the same namespace.
• Enhances stability and maintainability of deployments using ASO.

This update addresses potential selector misconfigurations and promotes more robust operations in multi-controller setups.

How does this PR make you feel?

Checklist

• this PR contains documentation
• this PR contains tests
• this PR contains YAML Samples

[matthchr]

We are interested in doing something like this, but as called out in the linked issue #4277, just making this doesn't work I don't think because it can't be changed on existing deployments. I think we'll need something more involved, though I also need to check if changing the deployment mode to Recreate makes this any easier.

[bingikarthik]

Yes, agree this won't apply on existing deployments! To apply probably deployment strategy to have: Recreate(i.e., need to rollout following PR: #4466)