Fixed #34806 -- Made cached_db session backend resilient to cache write errors.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

tests/cache/failing_cache.py

@@ -0,0 +1,7 @@
+from django.core.cache.backends.locmem import LocMemCache
+
+
+class CacheClass(LocMemCache):
+
+    def set(self, *args, **kwargs):
+        raise Exception("Faked exception saving to cache")