Fix ClusterTopologyBinding shortName collision with pre-rename CRD

[SAY-5]

What type of PR is this?

/kind bug
/kind api

What this PR does / why we need it:

ClusterTopologyBinding still claims the shortName ct, which was ClusterTopology's shortName before the rename in #616. Helm does not remove the old CRD on upgrade, so a cluster that ran the pre-rename version ends up with both CRDs claiming ct, the new CRD never reaches Established, and the operator crash loops on startup. Giving the renamed type its own shortName ctb removes the collision.

Which issue(s) this PR fixes:

Fixes #801

Special notes for your reviewer:

Ran make --directory=operator/api generate to regenerate the CRD yaml instead of hand editing it.

Does this PR introduce a API change?

ClusterTopologyBinding's kubectl short name changed from ct to ctb to avoid colliding with the pre-rename ClusterTopology CRD on upgraded clusters.

Additional documentation e.g., enhancement proposals, usage docs, etc.:

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[SAY-5]

Closing, #812 landed the same ct to ctb change and shipped in alpha.13.