feat: filter by current site organizations

[andrey-canon]

Description

This change filters out course enrollments whose organization is no available for the current site when the site configuration is enabled

I am proposing this change because when an instance contains multiple sites, each of which has access to only specific organizations, there is an issue where the API returns all courses a user is enrolled in, even if the current site does not have access to certain organizations. Although the API offers a query parameter to filter by organization, this parameter only supports one organization at a time, whereas a site may have access to multiple organizations.

Testing instructions

1. Enable site configuration
2. set the course_org_filter value
3. Go to /api/mobile/v4/users/<username>/course_enrollments/ and check that the result doesn't contain any invalid organization

[openedx-webhooks]

Thanks for the pull request, @andrey-canon!

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[mphilbrick211]

Hi @andrey-canon! Just flagging that there's a failing check here.

[mphilbrick211]

@andrey-canon hi there! Just checking to see if this is still in progress?

[andrey-canon]

@andrey-canon hi there! Just checking to see if this is still in progress?

Hi @mphilbrick211, nop, this is ready for review.

[andrey-canon]

Hi @felipemontoya, @mariajgrimaldi could you please take a look of this ?