Cluster Autoscaler: Auto-generate the supported flags table in docs

[gjtempleton]

Which component are you using?:
Cluster autoscale

Is your feature request designed to solve a problem? If so describe the problem this feature should solve.:

Auto-generate the very long table of supported flags for the CA in our FAQ to reduce the chance of either missing new flags, or failing to remove/update flags which are no longer supported or which have changed their defaults.

Describe the solution you'd like.:
Likely a new hack script with a PR time run to check for drift.

Describe any alternative solutions you've considered.:

Additional context.:
N/A

[gjtempleton]

/area cluster-autoscaler
/good-first-issue
/help-wanted

[k8s-ci-robot]

@gjtempleton:
This request has been marked as suitable for new contributors.

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In response to this:

/area cluster-autoscaler
/good-first-issue
/help-wanted

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[rainfd]

/assign

[rainfd]

@gjtempleton
Update directly on the original FAQ?
No need to update the helm chart related fields?

[gjtempleton]

@rainfd No need to update the Helm chart, we already have linting on the Readme for the chart, and we just link out to the CA's Readme for the extraArgs values option that corresponds to the runtime args to the CA.

[Shubham82]

/triage accepted