Change capacitybuffers scope from Cluster to Namespaced

[jakubin]

What type of PR is this?

/kind bug
/kind api-change

What this PR does / why we need it:

CapacityBuffers were meant to be Namespaced, not Cluster-scoped.

Which issue(s) this PR fixes:

Fixes b/457378075

Special notes for your reviewer:

Does this PR introduce a user-facing change?

For more information on release notes see: https://git.k8s.io/community/contributors/guide/release-notes.md

capacitybuffers.autoscaling.x-k8s.io scope changed from Cluster to Namespaced.

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jakubin / name: Jakub Binkowski (00b9bb2)

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[BigDarkClown]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BigDarkClown, jakubin

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