Automated cherry pick of #3952: [StatefulSet] Disallow changes to PodSpec fields other than the image field

[mbobrovskyi]

Cherry pick of #3952 on release-0.10.

#3952: [StatefulSet] Disallow changes to PodSpec fields other than the image field

For details on the cherry pick process, see the cherry pick requests page.

NONE

[k8s-ci-robot]

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[netlify]

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[mbobrovskyi]

/assign @mimowo

[mimowo]

/hold
As discussed offline with @mbobrovskyi we would first investigate if we can allow easily changes to any container fields which don't change the role hash. This will block updates to resources, but allow to changes to not just image but also other fields such as "args". Then, we would cherry-pick both PRs as one with two commits.

[mimowo]

/close
This will be replaced by a cherry-pick combining it with #4081

[k8s-ci-robot]

@mimowo: Closed this PR.

In response to this:

/close
This will be replaced by a cherry-pick combining it with #4081

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