Return max group access level in the projects API

Currently if a project is inside a nested group and a user doesn't have
specific permissions for that group but does have permissions on a
parent group the `GET /projects/:id` API call will return the following
permissions:

```json
permissions: { project_access: null, group_access: null }
```

It could also happen that the group specific permissions are of lower
level than the ones the user has in parent groups. This patch makes it
so that the permission returned for `group_access` is the highest from
amongst the hierarchy, which is (ostensibly) the information that the
API user is interested in for that field.

1 files changed, 4 insertions, 0 deletions

diff --git a/app/models/group.rb b/app/models/group.rb
index edac2444c4d..22814e35ca8 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -382,6 +382,10 @@ class Group < Namespace
     end
   end
 
+  def highest_group_member(user)
+    GroupMember.where(source_id: self_and_ancestors_ids, user_id: user.id).order(:access_level).last
+  end
+
   def hashed_storage?(_feature)
     false
   end