fix(deps): update dependency react-pdf to v7 [security] #1813

[milad-emami]

Description

Updates react-pdf to version 7 and improves PDF worker configuration by using CDN delivery.

Changes

• Update PDF.js worker configuration to use CDN
• Remove local PDF worker file from public directory
• Add TextLayer CSS import for better PDF rendering
• Configure worker source URL to use CDNJS
• Improve PDF rendering stability and security

Testing Instructions

1. Navigate to any page with PDF preview functionality
2. Verify PDF files load and display correctly
3. Test PDF navigation (next/previous pages)
4. Verify page number input works
5. Check PDF rendering in different screen sizes

Related Information

• Issue: #1813
• Previous worker configuration used local file
• New configuration uses CDNJS for better performance and security

[openedx-webhooks]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e39533c) to head (c1de9bc).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #372   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          109       109           
  Lines         1086      1085    -1     
  Branches       165       165           
=========================================
- Hits          1086      1085    -1     

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