Allow `fsUser` field to be set in `PodSecurityContext` on ephemeral volumes

[lamabro23]

Enhancement Description

• Allow fsUser field to be set in PodSecurityContext on ephemeral volumes.
• Kubernetes Enhancement Proposal:
• Discussion Link: recording, meeting notes May 1st
• Primary contact (assignee):
• Responsible SIGs: sig-storage
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y):
  • Beta release target (x.y):
  • Stable release target (x.y):
• Alpha
  • KEP (k/enhancements) update PR(s):
  • Code (k/k) update PR(s):
  • Docs (k/website) update PR(s):

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[k8s-ci-robot]

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