[ENG-8655] Fix/eng 8655 (#11375)

* Add a new page for pending preprint moderation

* Add template for pending moderation

* Remove new flask view

Author: Vlad0n20

api/preprints/views.py

@@ -158,6 +158,10 @@ def get_preprint(self, check_object_permissions=True, ignore_404=False):
             or preprint.machine_state == ReviewStates.WITHDRAWN.value,
         )
         if not preprint_is_public and not user_is_contributor and not user_is_reviewer:
+            if preprint.is_pending_moderation:
+                raise PermissionDenied(
+                    detail='This preprint is pending moderation and is not yet publicly available.',
+                )
             raise NotFound
 
         return preprint

osf/models/preprint.py

@@ -695,6 +695,24 @@ def is_preprint_orphan(self):
     def has_submitted_preprint(self):
         return self.machine_state != DefaultStates.INITIAL.value
 
+    @property
+    def is_pending_moderation(self):
+        if self.machine_state == DefaultStates.INITIAL.value:
+            return False
+
+        if not self.provider or not self.provider.reviews_workflow:
+            return False
+
+        from api.providers.workflows import PUBLIC_STATES
+
+        workflow = self.provider.reviews_workflow
+        public_states = PUBLIC_STATES.get(workflow, [])
+
+        if self.machine_state not in public_states:
+            return True
+
+        return False
+
     @property
     def deep_url(self):
         # Required for GUID routing