Fixed #33984 -- Reverted "Fixed #32980 -- Made models cache related managers."

This reverts 4f8c7fd9d91b35e2c2922de4bb50c8c8066cbbc6 and adds
two regression tests:
- test_related_manager_refresh(), and
- test_create_copy_with_m2m().

Thanks joeli for the report.

1 files changed, 2 insertions, 7 deletions

diff --git a/tests/model_regress/test_state.py b/tests/model_regress/test_state.py
index 1814458ba7..8b0f087829 100644
--- a/tests/model_regress/test_state.py
+++ b/tests/model_regress/test_state.py
@@ -1,12 +1,7 @@
-from django.db.models.base import ModelState, ModelStateCacheDescriptor
+from django.db.models.base import ModelState, ModelStateFieldsCacheDescriptor
 from django.test import SimpleTestCase
 
 
 class ModelStateTests(SimpleTestCase):
     def test_fields_cache_descriptor(self):
-        self.assertIsInstance(ModelState.fields_cache, ModelStateCacheDescriptor)
-
-    def test_related_managers_descriptor(self):
-        self.assertIsInstance(
-            ModelState.related_managers_cache, ModelStateCacheDescriptor
-        )
+        self.assertIsInstance(ModelState.fields_cache, ModelStateFieldsCacheDescriptor)