Update custom model.

Updates metadata for an existing custom model.

All custom models must support at least one target type (binaryClassification, regression).
Custom inference models can only support a single target type.

Setting positiveClassLabel and negativeClassLabel to null will set
the labels to their default values (1 and 0 for positiveClassLabel and negativeClassLabel,
respectively).

Setting positiveClassLabel, negativeClassLabel, 'targetName` is disabled if model
has active deployments or assigned training data.

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