[Core] aaz: Fix AAZBearerTokenCredentialPolicy to support MSIAuthenticationWrapper crendital (#23471)

Author: kairu-ms

src/azure-cli-core/azure/cli/core/aaz/_http_policy.py

@@ -58,6 +58,8 @@ def _need_new_token(self):
 
     @property
     def _need_new_aux_tokens(self):
+        if not hasattr(self._credential, 'get_auxiliary_tokens'):
+            return False
         if not self._aux_tokens:
             return True
         for token in self._aux_tokens:
@@ -91,8 +93,11 @@ def authorize_request(self, request, *scopes, **kwargs):
         :param ~azure.core.pipeline.PipelineRequest request: the request
         :param str scopes: required scopes of authentication
         """
-        self._token = self._credential.get_token(*scopes, **kwargs)
-        self._aux_tokens = self._credential.get_auxiliary_tokens(*self._scopes)
+        if self._need_new_token:
+            self._token = self._credential.get_token(*scopes, **kwargs)
+
+        if self._need_new_aux_tokens:
+            self._aux_tokens = self._credential.get_auxiliary_tokens(*self._scopes)
 
         self._update_headers(request.http_request.headers)