NAS-132959 / 24.10.2 / Mark extent read-only if underlying zvol is R/O (by bmeagherix)

[bugclerk]

Automatic cherry-pick failed. Please resolve conflicts by running:

git cherry-pick -x b4b7f7501ca3d512c2af120cd2cd4fef723f8853
git cherry-pick -x 6a93be9263c4bd9b0cc65ab5867892eaded0843b
git cherry-pick -x 0e803cfe2e4bc84a37a3a8a79c066e865a39d361

If the original PR was merged via a squash, you can just cherry-pick the squashed commit:

git reset --hard HEAD~4
git cherry-pick -x bca13acb365ef5e95de7a111af2f78fb061ee4d1

If a SCST extent is based upon a zvol, then keep the extent ro setting in sync with the zvol readonly property.

• Update extent ro prop if zvol readonly changes.
• Update zvol readonly prop if extent is ro changed
• Add unit test test__target_readonly_extent

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• CI test run is here.
• Also did some manual testing with Windows client.

Original PR: #15195
Jira URL: https://ixsystems.atlassian.net/browse/NAS-132959

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