Split OpenAPI V2 and V3 Config Initialization

[Jefftree]

/kind feature

What this PR does / why we need it:

Split up initialization for OpenAPI V2 and V3. This allows the config.GetDefinitions to be called and definitions generated once for all OpenAPI V3 builders rather than generating a new one per group/version.

Commits are separated for easier review:

1. update vendor (kube-openapi)
2. regenerate OpenAPI V3 (allOf refs + builder3 bug fixes in the kube-openapi change)
3. Update tests to capture allOfs
4. Separate config file for OpenAPI V2 and V3

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Wrapping refs with allOfs is a fix for us to publish valid OpenAPI. OpenAPI v3 spec dictates that refs may not have sibling elements which is a condition we violate in OpenAPI V2. See #106387 for more details.

Does this PR introduce a user-facing change?

Yes, OpenAPI V3 bug fixes + allOf wraps around $refs to publish a valid OpenAPI

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

[Jefftree]

/cc @apelisse @jiahuif @alexzielenski

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[Jefftree]

Rebased off latest master branch to avoid a conflict. Please re-lgtm

[lavalamp]

/lgtm

[pacoxu]

/retest
/skip

[k8s-triage-robot]

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/retest

[Jefftree]

Rebased again due to openapiv3*.json update

[Jefftree]

/retest

[lavalamp]

/lgtm

[Jefftree]

/hold

This is covered by #109031 and I'll be rebasing that PR instead going forward

[cici37]

/triage accepted

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: apelisse, dims, Jefftree, lavalamp

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[k8s-ci-robot]

@Jefftree: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-integration	67d3dbf	link	true	/test pull-kubernetes-integration
pull-kubernetes-e2e-gce-ubuntu-containerd	67d3dbf	link	true	/test pull-kubernetes-e2e-gce-ubuntu-containerd

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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