feat: Enable europe-west6 and northamerica-northeast2 regions

Co-authored-by: Eugene Kim <[email protected]>

Author: conankun

google/cloud/aiplatform/constants/base.py

@@ -28,7 +28,9 @@
     "europe-west2",
     "europe-west3",
     "europe-west4",
+    "europe-west6",
     "northamerica-northeast1",
+    "northamerica-northeast2",
     "us-central1",
     "us-east1",
     "us-east4",