Add support to learnpath categories in course sessions

[AngelFQC]

Current behavior / Resultado actual / Résultat actuel

The learnpath categories only works in courses, but no in sessions

Expected behavior / Resultado esperado / Résultat attendu

Manage learnpath categories in course sessions

[ywarnier]

At the moment learning path categories can be created and deleted from the base course.
In the session-course, the categories created in the base course can be seen, hidden or put on the session-course homepage, but you cannot create a new category.
So this feature is about being able to create new categories in the session-course.
However, we have to prevent learning paths from the base course to be placed inside a session-course category, because it would have complex results.

[ywarnier]

This does not work yet.

• Create a course A
• Create a session A1
• Add course A to session A1
• Go to "My courses"
• Enter base course A
• Enter the learning paths tool
• Create a category LPCAT1
• Create a learning path LP1
• Go to "My sessions"
• Enter course A in session A1
• Enter the learning paths tool
• Create a category LPCAT1S1
• In the list, I should see LPCAT1S1 with a yellow star next to it because it is a session-only resource (for this session)
• Go to "My courses"
• Enter base course A
• Enter the learning paths tool
• I should not see LPCAT1S1 (because it is a session-only resource)

Note that this is also true if there is another session (A2) with this course : LPCAT1S1 should only be visible in session A1, not A2.