Move CSIVolumeFSGroupPolicy to GA

[dobsonj]

This updates the reference for feature gates to move CSIVolumeFSGroupPolicy from beta to GA in 1.23.

Issue: kubernetes/enhancements#1682
Feature gate PR: kubernetes/kubernetes#105940
KEP: https://github.com/kubernetes/enhancements/blob/master/keps/sig-storage/1682-csi-driver-skip-permission/README.md
Docs: https://kubernetes-csi.github.io/docs/support-fsgroup.html

/cc @gnufied

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[reylejano]

Hi @dobsonj ,
Since this update is for the 1.23 release, can you edit this PR so that the PR is against the dev-1.23 branch.

Thank you!

/cc @jlbutler
/assign @ramrodo

[dobsonj]

Ah, I should have opened this against the dev-1.23 branch.
Replacing this PR with #30280
/close

[k8s-ci-robot]

@dobsonj: Closed this PR.

In response to this:

Ah, I should have opened this against the dev-1.23 branch.
Replacing this PR with #30280
/close

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