perf: improve API performance #3106
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What are the relevant tickets?
None
Description (What does it do?)
Improves API performance for courses, programs, and course_runs API.
Screenshots (if appropriate):
Before:
After
How can this be tested?
Additional Context
There are still a few N+1 queries in courses and the course runs API due to the CMS Pages like CertificatePage and FacultyMembersPage. We cannot do anything simple to avoid those queries as there are no relational mappings.