feat: filter by current site organizations

[andrey-canon]

Description

Limit API result to current organizations

Testing instructions

1. Go to /api/mobile/v4/users/<username>/course_enrollments/ and check that the result doesn't contain any invalid organization

Deadline

"None" if there's no rush, or provide a specific date or event (and reason) if there is one.

Other information

Include anything else that will help reviewers and consumers understand the change.

• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, security, or accessibility.
• If your database migration can't be rolled back easily.

[johanseto]

It seems working. In only have some doubt related the count field one erollments because in the after shows me 0.
Also maybe is the difference from primary?

Before

After

[johanseto]

I tested with other tenant and yes, seem it count after the primary course_enrollment.