Deprecate the `QueueVisibility` feature gate and corresponding API

[PBundyra]

What would you like to be cleaned: I suggest coming with a plan to deprecate the QueueVisibility API. I would start with deprecating the QueueVisiblity feature gate and deleting logic behind it, and then remove the visibility field from ClusterQueue's Status when migrating to a next beta version of Kueue API.

Why is this needed: There was the visibility API introduced that covers all business needs that were cover by the QueueVisibility API and more. The visibility API resolves all drawback related to the QueueVisibility API and addresses its limitations. For now I don't see a rationale for maintaining the QueueVisiblity API. Additionally I believe having two different ways (and two feature gates) to monitor pending workloads may lead to a little confusion regarding their pros and cons.