[backend] Upgrade of mistral ai client version (#9481)

[aHenryJard]

Proposed changes

• Update required code changes with mistral AI version upgrade.

Tested with OBAS email generation and HTML report generation.

Related issues

• closes Major upgrade of mistrail ai client to 1.3.6 #9481
  Will close Update dependency @mistralai/mistralai to v1 #9442

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

Further comments

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 7 lines in your changes missing coverage. Please review.

Project coverage is 65.24%. Comparing base (f8d757f) to head (a9b15c5).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ti-platform/opencti-graphql/src/database/ai-llm.ts	22.22%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9482      +/-   ##
==========================================
- Coverage   65.26%   65.24%   -0.02%     
==========================================
  Files         630      630              
  Lines       60311    60314       +3     
  Branches     6777     6770       -7     
==========================================
- Hits        39361    39354       -7     
- Misses      20950    20960      +10     

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[delemaf]

Test ok 👍