feat: read from fixed priced usd for course sidebar

[brobro10000]

Updates getCoursePrice to read from fixedPriceUsd if it exists.

Since the listPrice which is defined upstream of getCoursePrice is defined by the listPrice.usd value from canRedeem, no further changes are needed in the frontend to ensure that the fixed price is displayed if it exists. This is because the source of truth for price (NormalizedContentMetadataSerializer.get_content_price [source]) has been updated to read fixed_price_usd if it exist, and propogates to the listPrice.usd downstream within canRedeem once these PRs are merged.

• feat: Add fixed_price_usd logic to normalized metadata content price enterprise-catalog#931
• feat: retrieve content_price from normalized_metadata_by_run enterprise-subsidy#300

[Bug fix]
Fixed a bug I ran into where the subscription expiration modal became a blocking modal.

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)
• Ensure English strings are marked for translation. See documentation for more details.

Only if submitting a visual change

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

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.43%. Comparing base (5f5a7c5) to head (3e3c018).

Files with missing lines	Patch %	Lines
src/components/course/data/utils.jsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1201      +/-   ##
==========================================
- Coverage   88.44%   88.43%   -0.01%     
==========================================
  Files         398      398              
  Lines        8456     8458       +2     
  Branches     2034     2035       +1     
==========================================
+ Hits         7479     7480       +1     
- Misses        935      936       +1     
  Partials       42       42              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.