Support Conditional Updates - Cluster update "Update Version" modal

The "Update Version" modal on the cluster settings page should be updated to give users information about recommended, not recommended, and blocked update versions.

• When the modal is opened, the latest recommended update version should be pre-selected in the version dropdown.
• Blocked versions should no longer be displayed in the version dropdown, and should instead be displayed in a collapsible field below the dropdown.
• When blocked versions are present, a link should be provided to the cluster operator tab. The version dropdown itself should have two labeled sections: "Recommended" and "Supported but not recommended".
• When the user selects a "Supported but not recommended" item from the version dropdown, an inline info alert should appear below the version selection field and should provide a link to known risks associated with the selected version. This is an external link provided through the ClusterVersion API.