SSE: Localize/Contain Errors within an Expression (#73163)

Changes SSE to not always fail all queries when one fails. Now only the query itself, and nodes that depend on it will error.
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Co-authored-by: Gilles De Mey <gilles.de.mey@gmail.com>

pkg/expr/ml/node.go

@@ -39,7 +39,7 @@ func UnmarshalCommand(query []byte, appURL string) (Command, error) {
 	var expr CommandConfiguration
 	err := json.Unmarshal(query, &expr)
 	if err != nil {
-		return nil, fmt.Errorf("failed to unmarshall Machine learning command: %w", err)
+		return nil, fmt.Errorf("failed to unmarshal Machine learning command: %w", err)
 	}
 	if len(expr.Type) == 0 {
 		return nil, fmt.Errorf("required field 'type' is not specified or empty.  Should be one of [%s]", Outlier)