feat: PDF auto-conversion

[Kelketek]

Description

This merge request enables auto-conversion of documents to PDF, provided the Gotenberg service is installed and configured.

Supporting information

• Product Proposal this is implementing
• xblocks-core version needed to test this
• Tutor Plugin needed to test this

Testing instructions

1. Follow the instructions in the xblocks-core repository and use the linked version.
2. Install this MFE in development mode according to the directions in the README
3. Check out this branch
4. Go to a course and find PDF in the advanced components. Add it.
5. Attempt to upload a file. There should not be an option to upload office documents, but PDFs should work. Do the same with a library component. Likewise, you should only be able to use PDFs.
6. Install the Tutor plugin for Gotenberg linked above
7. Restart Tutor
8. Go back to the course and try to upload an office document. This should work now.
9. Try with the library block as well.

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, @Kelketek!

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[wittjeff]

PDFs can be made as accessible (or not) as Word or PowerPoint files. I suggest a more general reminder that uploaded files need to be made natively accessible, or also upload clearly identified conforming alternative versions.

[Kelketek]

@wittjeff Looked into it and you're right. I've only ever thought of PDFs as a postscript format for printers and every attempt I've had to try to extract useful text from them tends to be frustrating, but the format supports much better accessibility than I realized.

I've updated the phrasing here. Let me know if it works for you.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.95%. Comparing base (de0e1c4) to head (ff9a08c).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3201      +/-   ##
==========================================
+ Coverage   95.91%   95.95%   +0.03%     
==========================================
  Files        1397     1397              
  Lines       33558    33607      +49     
  Branches     7914     7681     -233     
==========================================
+ Hits        32187    32246      +59     
- Misses       1312     1317       +5     
+ Partials       59       44      -15     

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