feat: import tags to existing taxonomy

[rpenido]

Description

This PR adds a new menu item in the Taxonomy Card menu and the Taxonomy Details menu to allow users to import tags to existing Taxonomies by importing a CSV/JSON file. This overwrites the current tags.

Testing instructions

1. Have an import taxonomy template ready to be imported. You could get one from below:
   • template.csv
   • template.json
2. Go to the taxonomy list page (http://localhost:2001/taxonomies)
3. Click on the menu from an existing taxonomy card
4. You will be prompted to select a file to be imported.
5. Canceling the prompt will abort the operation
6. If the taxonomy is imported successfully, you will see an alert: Taxonomy imported successfully.
7. Importing an invalid taxonomy file, you will see an alert: Import failed - see details in the browser console. The error info will be logged in the browser console.

---

Private-ref: FAL-3536

[pomegranited]

This is looking good @rpenido , just needs linting and tests.

Could you also make sure the new "Re-import" menu item is added to the "Actions" menu on the Taxonomy Detail page too?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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##             rpenido/fal-3532-import-taxonomy      #11   +/-   ##
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[pomegranited]

👍 one nit, but LGTM!

@bradenmacdonald can @rpenido merge this into openedx#675 and get both these "import tags" features reviewed by upstream at once?

• I tested this on my devstack. There's a known issue with re-importing tags that affects the backend logic, but
• I read through the code (on #11)
• I checked for accessibility issues by using my keyboard to navigate
• Includes documentation
• User-facing strings are extracted for translation

[bradenmacdonald]

@pomegranited

@bradenmacdonald can @rpenido merge this into openedx#675 and get both these "import tags" features reviewed by upstream at once?

Yes please!

[rpenido]

Yes please!

Done! openedx#675