feat: add export library tags menu [FC-0049]

[rpenido]

Description

This PR adds an item in the Settings menu to allow a call of the function that exports the library tags to a CSV file.

Supporting Information

• Closes:
  • https://github.com/openedx/modular-learning/issues/173
• Depends on:
  • https://github.com/openedx/edx-platform/pull/34246

Testing instructions

1. Use https://github.com/open-craft/taxonomy-sample-data/ to create some taxonomies.
2. Go to the library page in Studio and add some tags to the units in the course using the Manage Tags option
3. Checkout THIS branch and reload the library authoring page
4. Click on the Export Tags menu from the detail page of an existing library
5. Check if a CSV file is downloaded with the Library structure and the tags applied to its items.

---

Private-ref:

• FAL-3611

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (de8582a) 53.14% compared to head (e4d7c82) 53.14%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #412 +/- ## ======================================= Coverage 53.14% 53.14% ======================================= Files 80 80 Lines 2021 2021 Branches 368 368 ======================================= Hits 1074 1074 Misses 914 914 Partials 33 33 ```

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[itsjeyd]

@rpenido @pomegranited It looks like these changes are ready for upstream review. I'm changing status on the Contributions board accordingly, but let me know if you have any objections.

@navinkarkera Could you give this a maintainer review?

[rpenido]

Hi @navinkarkera! Thank you for the review. The edx-platform PR got merged!

[openedx-webhooks]

@rpenido 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.