[backend] fix Remote_logout following authentication conversion (#14756)

[CelineSebe]

Proposed changes

• Improvement of the get function for Boolean data

Related issues

• Fix [Authentication] Conversion error during local strategy conversion #14756

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

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.63%. Comparing base (efdef97) to head (f54fa1d).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
...ider/authenticationProvider-migration-converter.ts	88.88%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #14776      +/-   ##
==========================================
+ Coverage   32.36%   32.63%   +0.26%     
==========================================
  Files        3098     3107       +9     
  Lines      211049   213204    +2155     
  Branches    38249    38687     +438     
==========================================
+ Hits        68312    69582    +1270     
- Misses     142737   143622     +885     

Flag	Coverage Δ
opencti-client-python	45.48% <ø> (ø)
opencti-front	2.81% <ø> (-0.02%)	⬇️
opencti-graphql	67.90% <88.88%> (+0.15%)	⬆️

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