[cherry-pick] PWX-36509 : StorageCluster schema changes to support parallel portworx upgrades #1576
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What this PR does / why we need it:
This PR will add a new field to control the PX upgrade behavior. The default behavior would be to have a non-disruptive upgrade. But users should be able to disable that and go back to the old behavior of upgrading nodes in parallel without worrying about the disruption.
Which issue(s) this PR fixes (optional)
Closes # https://purestorage.atlassian.net/browse/PWX-36509