Add core scale objects events handler for capacity buffers controller

[abdelrahman882]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR implements core scale object informers and event handlers within the CapacityBuffer controller to enable dynamic and efficient reconciliation.

Why it is needed:
The CapacityBuffer controller must be responsive to the state of the cluster. By implementing these informers, the controller can now react in real-time to changes in user-defined workloads and resource constraints, ensuring that the capacity buffer always accurately reflects the desired percentage of the actual workload while respecting cluster-wide quotas.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: abdelrahman882
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