feature(ci): generate flags & metrics documentation

[vflaux]

What does it do ?

Add jobs check that flags & metrics documentation is up to date.

Motivation

Documentation updates are not validated by CI and changes can be missed in reviews. See #5834

More

• [x] Yes, this PR title follows Conventional Commits
• [ ] Yes, I added unit tests
• [ ] Yes, I updated end user documentation accordingly

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @vflaux. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ivankatliarchuk]

There are unit tests and they executed as part of a build. Worth double check the code

[k8s-triage-robot]

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/lifecycle stale