Mark KEP-2395 as implemented

[carlory]

• One-line PR description: Mark KEP-2395 as implemented

• Issue link: Removing In-Tree Cloud Providers #2395

• Other comments: Update 2395-removing-in-tree-cloud-providers to stable status

[carlory]

If you are already working on this, feel free to close my PR.

/cc @dims @elmiko

kubernetes/kubernetes@7f9a0ef promoted the feature gates to GA. I'm not sure whether there is remaining work to do here because the prod-readiness of this KEP is not updated.

[k8s-ci-robot]

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[elmiko]

thank you @carlory for cleaning up the last bits of our mess 🙏

/lgtm