feat: ora staff grader backend (#29828)

- Adds Enhanced Staff Grader (ESG) backend-for-frontend (BFF) in `lms/djangoapps/ora_staff_grader`
    - Adds routing to ESG BFF at `{lms_url}/api/ora_staff_grader/*`
    - Adds mock implementation routing at `{lms_url}/api/ora_staff_grader/mock/*`
    - Adds `ORA_GRADING_MICROFRONTEND_URL` setting for routing to ESG microfrontend (MFE)
- Updates to the teams app:
    - Add`get_teams_in_teamset` to the teams API.
    - Add `get_team_names` to teams service.
- Adds `openassessment.staffgrader` app for appropriate ORA migrations.
- Modifies management commands for creation of users.
- Updates test factory to return display org with course overview.

Co-authored-by: jansenk <jkantor@edx.org>
Co-authored-by: Leangseu Kim <lkim@edx.org>
Co-authored-by: Ben Warzeski <bwarzeski@edx.org>

.github/workflows/unit-test-shards.json

@@ -59,6 +59,7 @@
       "lms/djangoapps/mailing/",
       "lms/djangoapps/mobile_api/",
       "lms/djangoapps/monitoring/",
+      "lms/djangoapps/ora_staff_grader/",
       "lms/djangoapps/program_enrollments/",
       "lms/djangoapps/rss_proxy/",
       "lms/djangoapps/save_for_later/",