Remove references to oidc/DOP endpoint.

[dianakhuang]

https://openedx.atlassian.net/browse/BOM-1225

Analytics Pipeline Pull Request

Make sure that the following steps are done before merging:

• [x] Before merging run full acceptance tests suite and provide URL for the acceptance tests run.
• [x] A member of data engineering team has approved the pull request.

[codecov[bot]]

Codecov Report

Merging #799 into master will decrease coverage by 0.21%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #799      +/-   ##
==========================================
- Coverage   74.53%   74.31%   -0.22%     
==========================================
  Files         211      211              
  Lines       24193    24423     +230     
==========================================
+ Hits        18032    18150     +118     
- Misses       6161     6273     +112

Impacted Files	Coverage Δ
...asks/warehouse/load_internal_reporting_database.py	51.28% <0%> (-4.32%)	:arrow_down:
...asks/warehouse/load_vertica_schema_to_snowflake.py	39.09% <0%> (-2.22%)	:arrow_down:
edx/analytics/tasks/common/vertica_export.py	40.87% <0%> (-1.87%)	:arrow_down:
edx/analytics/tasks/common/tests/test_sqoop.py	99.47% <0%> (+0.13%)	:arrow_up:
edx/analytics/tasks/common/sqoop.py	92.07% <0%> (+1.16%)	:arrow_up:

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