Previously, it had some basic manual masquerading by calling the
endpoint with ?user=mytestuser. But this adds standard session
masquerading support to the endpoint as well.
This support is limited by LS's own partition group support. It
only looks at the enrollment track partition currently. Further
FBE and cohort partition support will come later.
But this commit opens up normal session masquerading for:
- Generic student
- Specific student
- Enrollment track
AA-1151
4418c66171