revert: Partial revert of 17236 (#17383)

Co-authored-by: John Bodley <john.bodley@airbnb.com>

superset/utils/core.py

@@ -1326,6 +1326,11 @@ def get_metric_names(metrics: Sequence[Metric]) -> List[str]:
     return [metric for metric in map(get_metric_name, metrics) if metric]
 
 
+def get_first_metric_name(metrics: Sequence[Metric]) -> Optional[str]:
+    metric_labels = get_metric_names(metrics)
+    return metric_labels[0] if metric_labels else None
+
+
 def ensure_path_exists(path: str) -> None:
     try:
         os.makedirs(path)