Missing Read on Join Resource for many_to_many complains about destination resource missing read action

**Describe the bug**
When loading a resource through a many to many and missing a read action on the join table an error is thrown complaining the destination resource is missing the read action. In my case the destination resource had a read but not the join resource.

**To Reproduce**
A many to many relationship where the join table doesn’t contain a read but others have.

**Expected behavior**
Error should say the join resource is missing the read action.

**Runtime**
- Elixir version 1.17.3
- Erlang version 27.1
- OS MacOS
- Ash version 3.4.14
- any related extension versions ash_postgres

**Additional context**
Add any other context about the problem here.

Start by reproducing a many-to-many relationship where the join resource lacks a read action while the destination resource has one. Trace the validation or error-reporting path for the missing action; done means the error identifies the join resource rather than the destination resource.

Written by the indexing model from the issue text.