Fix MNMG failures in mg_dgl_extensions (#2786)

This PR fixes the below errors that have popped up in MNMG testing. 
- [x] fix_out of index keys on MNMG graphs
- [x] fix loc/get_node_storage error  on MNMG graphs 
(Work around  rapidsai/cudf#11877)
- [x] Clear Cached Properties when they become invalid
- [x] Remove  6 pytest skipping as both these PRs have landed 
- #2751
- #2523
- [x] Change `vertex_col_names` to  `node_col_names`  to match DGL 
- [x] Ensure MNMG tests pass 
- [x] Work around the PG bug and also prevent redundant conversion to lists

Authors:
  - Vibhu Jawa (https://github.com/VibhuJawa)

Approvers:
  - Rick Ratzel (https://github.com/rlratzel)
  - Erik Welch (https://github.com/eriknw)

URL: #2786

python/cugraph/cugraph/dask/structure/mg_property_graph.py

@@ -12,7 +12,7 @@
 # limitations under the License.
 
 import cudf
-
+import numpy as np
 import cugraph
 import dask_cudf
 import cugraph.dask as dcg
@@ -488,7 +488,8 @@ def get_vertex_data(self, vertex_ids=None, types=None, columns=None):
                 if isinstance(vertex_ids, int):
                     vertex_ids = [vertex_ids]
                 elif not isinstance(vertex_ids,
-                                    (list, slice, self.__series_type)):
+                                    (list, slice, np.ndarray,
+                                     self.__series_type)):
                     vertex_ids = list(vertex_ids)
                 df = df.loc[vertex_ids]
 
@@ -724,7 +725,8 @@ def get_edge_data(self, edge_ids=None, types=None, columns=None):
                 if isinstance(edge_ids, int):
                     edge_ids = [edge_ids]
                 elif not isinstance(edge_ids,
-                                    (list, slice, self.__series_type)):
+                                    (list, slice, np.ndarray,
+                                     self.__series_type)):
                     edge_ids = list(edge_ids)
                 df = df.loc[edge_ids]