refactor: Migrate courseImport from redux store to React query

[ChrisChV]

Description

• Migrate courseImport from redux store to React query.
• Which user roles will this change impact? "Developer"

Supporting information

• Github issue: Switch from Redux to React Query + Context #2540
• Internal ticket: https://tasks.opencraft.com/browse/FAL-4288

Testing instructions

• Create a new course.
• In the course outline, go to Tools > Import.
• Upload a course file (you can export another course).
• Check that the course is imported successfully.

Other information

N/A

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @ChrisChV!

This repository is currently maintained by @bradenmacdonald.

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[codecov]

Codecov Report

❌ Patch coverage is 97.67442% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.39%. Comparing base (5672644) to head (74839f3).

Files with missing lines	Patch %	Lines
src/import-page/CourseImportContext.tsx	97.05%	2 Missing ⚠️
src/import-page/data/apiHooks.ts	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2902      +/-   ##
==========================================
+ Coverage   95.37%   95.39%   +0.02%     
==========================================
  Files        1332     1331       -1     
  Lines       30594    30585       -9     
  Branches     6925     6927       +2     
==========================================
- Hits        29178    29177       -1     
+ Misses       1359     1351       -8     
  Partials       57       57              

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[bradenmacdonald]

nice work ! 👏🏻