Store LTI1.3 assignment ID explicitly in the DB

[marcospri]

For:

• SPIKE: Start fetching course rosters using LTIA API #6185

To talk to the Name and Roles LTI API we use the service URL sent in LTI1.3 courses.

However to filter that by assignment we need to use the LTI1.3 assignment ID on that same course URL.

The ID is sent in all launches but if present, we prefer the LTI1.1 (for backwards compatibility).

With this PR we now store explicitly the LTI1.3 ID to later be use the call the LTI API.

Testing

• Launch a LTI1.1 assignment: https://hypothesis.instructure.com/courses/125/assignments/873

Nothing changes

• Launch a LTI1.3 assignment: https://hypothesis.instructure.com/courses/319/assignments/3308

The LTI1.3 is stored in the DB

• Check the values in the DB:

docker compose exec postgres psql -U postgres -c "select  resource_link_id, lti_v13_resource_link_id from assignment;"                                                                                                                                                                                                                                   
             resource_link_id             |       lti_v13_resource_link_id       
------------------------------------------+--------------------------------------
 f330509e8ee8e465a55c4c88a4fcc9ef1ee992bd |  c2e8a1acbf6534de1db7d9dc65f034f69e87735c | acf313e2-e654-47c5-8a2f-2b77becc47bc(2 rows)