🐛 Fix groupnames in examples

[xrstf]

Summary

I am not sure why, but the various GroupName constants and +groupName comments were widely inconsistent in the examples. That lead to a working codegen, but when trying to actually use the generated fake client, one would end with errors like

W0422 13:58:15.416218 201389 reflector.go:569] pkg/mod/k8s.io/[email protected]/tools/cache/reflector.go:251: failed to list *v1.TestType: no kind "TestTypeList" is registered for version "example/v1" in scheme "pkg/runtime/scheme.go:100"

Note the API group example, which is neither example.dev nor example.some.corp and so things won't work.

It is also seemingly necessary to attach a +groupName to the doc.go of every version, not just their parent package.

I included the three sample tests I adopted from upstream. They helped me ensure it's all working and I guess can help us ensure it keeps working, so I added testing the examples module to make test.

Release Notes

Fix inconsistent API groups in the example APIs

[mjudeikis]

/lgtm
/approve
/Hold
@gman0 can this merge? Will it impact a rebase?

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mjudeikis

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[kcp-ci-bot]

LGTM label has been added.

Git tree hash: 78b6b39ddaa4f307ef7c0aa378366b3d12bc23f0

[gman0]

/lgtm

[gman0]

All good @mjudeikis , thanks @xrstf !

[mjudeikis]

/hold cancel

[xrstf]

/cherrypick kcp-1.32.3

[kcp-ci-bot]

@xrstf: new pull request created: #103

In response to this:

/cherrypick kcp-1.32.3

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[xrstf]

/cherrypick kcp-1.31.6

[kcp-ci-bot]

@xrstf: new pull request created: #104

In response to this:

/cherrypick kcp-1.31.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.