azure: add allow_anonymous_login option to the schema (#6190)

dvc/config_schema.py

@@ -189,6 +189,7 @@ SCHEMA = {
                     "tenant_id": str,
                     "client_id": str,
                     "client_secret": str,
+                    "allow_anonymous_login": bool,
                     **REMOTE_COMMON,
                 },
                 "oss": {

dvc/fs/azure.py

@@ -147,7 +147,7 @@ class AzureFileSystem(ObjectFSWrapper):
         if (
             login_info["account_name"]
             and not any_secondary
-            and not config.get("allow_anonymous_login")
+            and not config.get("allow_anonymous_login", False)
         ):
             login_info["credential"] = DefaultAzureCredential(
                 exclude_interactive_browser_credential=False