[3.3] Patch for unmounting shared storage with a cluster update

[hanwen-pcluste]

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[gmarciani]

LGTM. May you please reference the original PRs where the changes come from in the description and that we will use this PR to generate the git diff file used by a patching script? Moreover, once we manually validate the change with tests, let's remember to record how we validated it.

Also let's be sure that PR checks succeed.