graduate ktesting to non-EXPERIMENTAL

[pohly]

/kind feature

Describe the solution you'd like

The API under ktesting is marked as EXPERIMENTAL. We should remove those remarks and commit to a stable API once we think that it is ready.

Anything else you would like to add:

Usage of that new code is starting in Kubernetes 1.25, for example kubernetes/kubernetes#110504

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue or PR as fresh with /remove-lifecycle stale
• Mark this issue or PR as rotten with /lifecycle rotten
• Close this issue or PR with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[pohly]

/remove-lifecycle stale
/lifecycle frozen