Remove unused course structure tables and jobs

[bmedx]

Analytics Pipeline Pull Request

Make sure that the following steps are done before merging:

• [ ] If you have a migration please contact data engineering team before merging.
• [ ] Before merging run full acceptance tests suite and provide URL for the acceptance tests run.
• [ ] A member of data engineering team has approved the pull request.

[codecov[bot]]

Codecov Report

Merging #851 (7d3665f) into master (fd6069b) will increase coverage by 0.74%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #851      +/-   ##
==========================================
+ Coverage   73.96%   74.71%   +0.74%     
==========================================
  Files         205      203       -2     
  Lines       23704    23261     -443     
==========================================
- Hits        17533    17379     -154     
+ Misses       6171     5882     -289     

Impacted Files	Coverage Δ
edx/analytics/tasks/warehouse/load_warehouse.py	50.00% <ø> (-0.71%)	:arrow_down:
...alytics/tasks/warehouse/load_warehouse_bigquery.py	53.39% <ø> (+3.39%)	:arrow_up:
...lytics/tasks/warehouse/load_warehouse_snowflake.py	52.34% <ø> (+2.67%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update fd6069b...7d3665f. Read the comment docs.