feat: enable TOP_DOWN_ASSIGNMENT feature

[jajjibhai008]

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

Attention: 106 lines in your changes are missing coverage. Please review.

Comparison is base (d36b78a) 84.87% compared to head (d09e8dc) 85.10%.
Report is 91 commits behind head on master.

Files	Patch %	Lines
...ntent/course-enrollments/CourseAssignmentAlert.jsx	27.27%	8 Missing ⚠️
src/components/course/data/hooks.jsx	87.93%	7 Missing ⚠️
...course-enrollments/course-cards/BaseCourseCard.jsx	89.85%	7 Missing ⚠️
src/components/my-career/VisualizeCareer.jsx	74.07%	6 Missing and 1 partial ⚠️
src/components/my-career/data/service.js	56.25%	7 Missing ⚠️
src/components/course/data/utils.jsx	95.89%	6 Missing ⚠️
...n-content/course-enrollments/CourseEnrollments.jsx	81.25%	6 Missing ⚠️
src/components/my-career/AddJobRole.jsx	60.00%	5 Missing and 1 partial ⚠️
src/components/my-career/data/hooks.jsx	50.00%	6 Missing ⚠️
...oard/main-content/course-enrollments/data/utils.js	81.48%	5 Missing ⚠️
... and 24 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #885      +/-   ##
==========================================
+ Coverage   84.87%   85.10%   +0.23%     
==========================================
  Files         320      334      +14     
  Lines        6399     6969     +570     
  Branches     1552     1709     +157     
==========================================
+ Hits         5431     5931     +500     
- Misses        941     1007      +66     
- Partials       27       31       +4     

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[adamstankiewicz]

As discussed in Slack, closing this PR in favor of enabling the feature flag via edx-internal (so it's specific to 2U/edX, not everyone who clones this repository);