Add nvtx annotations for Series and Index (#10374)

This PR adds some missing `nvtx` annotations for `Series` and `Index`.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #10374

python/cudf/cudf/core/frame.py

@@ -6921,12 +6921,12 @@ def _drop_rows_by_labels(
             raise KeyError("One or more values not found in axis")
 
         key_df = cudf.DataFrame(index=labels)
-        if isinstance(obj, cudf.Series):
+        if isinstance(obj, cudf.DataFrame):
+            return obj.join(key_df, how="leftanti")
+        else:
             res = obj.to_frame(name="tmp").join(key_df, how="leftanti")["tmp"]
             res.name = obj.name
             return res
-        else:
-            return obj.join(key_df, how="leftanti")
 
 
 def _apply_inverse_column(col: ColumnBase) -> ColumnBase: