Migrate `instructor_module_report` to use dimensional layer (blocked by mart migration)

Epic: #2072

File: src/ol_dbt/models/reporting/instructor_module_report.sql

Problem: References marts__combined_course_enrollment_detail and the organization_administration_report reporting model (which itself bypasses). Blocked by migration of the mart and the reporting model.

Note: This issue is blocked by the migration of the upstream mart model(s) it references. It should be addressed after those mart migrations are complete.

Acceptance criteria:

• Model references only dimensional/, mart, or reporting models (all of which use dimensional)
• No {{ ref('int__*') }} or {{ ref('stg__*') }} calls remain in this model or its upstream mart dependencies
• Model compiles and passes dbt tests

After the upstream mart and reporting-model migrations are complete, start with src/ol_dbt/models/reporting/instructor_module_report.sql and inspect its references to marts__combined_course_enrollment_detail and organization_administration_report. Confirm that upstream dependencies no longer bypass the dimensional layer, then run dbt compilation and tests. Done means the model and its upstream mart dependencies contain no int__* or stg__* refs and pass dbt tests.