Parse user errors log and set the user error code in the ControlPlaneHealthy health check to minimize user related VictorOps alerts

[jfortin-sap]

How to categorize this issue?

/area monitoring
/kind enhancement
/platform openstack

What would you like to be added:

Parse user errors log and set the user error code in the ControlPlaneHealthy health check to minimize user related VictorOps alerts

See Shoot health status conditions error codes https://github.com/gardener/gardener/blob/master/docs/extensions/shoot-health-status-conditions.md#error-codes

Why is this needed:

To minimize VictorOps alerts related to user errors

[gardener-robot]

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