[frontend] Improve management of images when moving from HTML to PDF (#8207)

[lndrtrbn]

Proposed changes

• Improve images in figures management

Related issues

• Images embedded in report content are sized at 100% in PDF exports #8207

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.37%. Comparing base (f51114e) to head (22b48d9).
⚠️ Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
...i-front/src/utils/htmlToPdf/utils/pdfImageWidth.ts	0.00%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #14715   +/-   ##
=======================================
  Coverage   32.37%   32.37%           
=======================================
  Files        3098     3098           
  Lines      211019   211025    +6     
  Branches    38241    38243    +2     
=======================================
+ Hits        68310    68313    +3     
- Misses     142709   142712    +3     

Flag	Coverage Δ
opencti-client-python	45.48% <ø> (ø)
opencti-front	2.83% <0.00%> (-0.01%)	⬇️
opencti-graphql	67.74% <ø> (+<0.01%)	⬆️

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[fellowseb]

Consider adding a unit test to setImagesWidth so that your use cases are documented. (Or to htmlToPdf with a spy on htmlToPdfMake)
A better testing strategy for pdf generation like this would be too have an integration test but would be too large for this fix. Maybe we can do it when moving away from CKEditor to make sure we have no regression.

[fellowseb]

Aspect-ratio-changing edits, with specific height values, are not possible in CKEditor ?

[lndrtrbn]

I will add the asked tests in an other PR