refactor(endpoints/api/repoemail): added in pre_oci model

### Description of Changes

this is so we can abstract away the data interface

[TESTING->locally with docker compose]

Issue: https://coreosdev.atlassian.net/browse/QUAY-626

## Reviewer Checklist

- [ ] It works!
- [ ] Comments provide sufficient explanations for the next contributor
- [ ] Tests cover changes and corner cases
- [ ] Follows Quay syntax patterns and format

endpoints/api/repoemail_models_pre_oci.py

@@ -0,0 +1,26 @@
+from data import model
+from endpoints.api.repoemail_models_interface import RepoEmailDataInterface, RepositoryAuthorizedEmail
+
+
+def _return_none_or_data(func, namespace_name, repository_name, email):
+  data = func(namespace_name, repository_name, email)
+  if data is None:
+    return data
+  return RepositoryAuthorizedEmail(email, repository_name, namespace_name, data.confirmed, data.code)
+
+
+class PreOCIModel(RepoEmailDataInterface):
+  """
+  PreOCIModel implements the data model for the Repo Email using a database schema
+  before it was changed to support the OCI specification.
+  """
+
+  def get_email_authorized_for_repo(self, namespace_name, repository_name, email):
+    return _return_none_or_data(model.repository.get_email_authorized_for_repo, namespace_name, repository_name, email)
+
+  def create_email_authorization_for_repo(self, namespace_name, repository_name, email):
+    return _return_none_or_data(model.repository.create_email_authorization_for_repo, namespace_name, repository_name,
+                                email)
+
+
+pre_oci_model = PreOCIModel()