governor handles system catalog version upgrade

Summary

This merge requests adds a new functionality to governor that handles system catalog version (.pico_propety.system_catalog_version) clusterwide upgrade with appropriate script. Scripts themselves are a subject to be written in each release respectively.

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• Close #973
• Cherry-pick to: none
• Docs follow-up: new issue
• Changelog is updated
• See also: !1468 (merged)