refactor: Extract get_additional_student_profile_attributes function

[igobranco]

Extract the configuration_helpers.get_value_for_org() call for fetching additional student profile attributes into a dedicated function to eliminate code duplication.

Description

This PR refactors the retrieval of additional student profile attributes to eliminate code duplication and improve maintainability.

Problem

The code for fetching additional_student_profile_attributes from site configuration was duplicated in two locations:

1. lms/djangoapps/instructor_analytics/basic.py in the get_student_features_with_custom() function
2. lms/djangoapps/instructor/views/api.py in the GetStudentsFeatures view
3. 2. lms/djangoapps/instructor/views/api_v2.py in the GenerateReportView view

This duplication made the code harder to maintain and increased the risk of inconsistencies.

Solution

Extracted the duplicated configuration retrieval logic into a dedicated function get_additional_student_profile_attributes() in the instructor_analytics.basic module. Both call sites now use this shared function.

Business requirement

It allows to monkey patch the new function get_additional_student_profile_attributes() for better extensibility.

For example on NAU installation to have a per course configuration to better align with our GDPR compliance of custom fields.

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