[backend] Cache decoded EE license (#13823)

[xfournet]

Proposed changes

• Cache the decoded EE license to avoid to check it at every request
• Ensure the raw PEM has not been changed since the cached value has been created

Related issues

• Fix EE license is decoded for each HTTP request #13823

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 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.84%. Comparing base (a837f71) to head (f5bc128).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...tform/opencti-graphql/src/http/httpChatbotProxy.ts	0.00%	1 Missing ⚠️
.../opencti-graphql/src/modules/settings/licensing.ts	95.65%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #13824   +/-   ##
=======================================
  Coverage   30.84%   30.84%           
=======================================
  Files        2910     2910           
  Lines      192266   192260    -6     
  Branches    39185    39185           
=======================================
+ Hits        59299    59300    +1     
+ Misses     132967   132960    -7     

Flag	Coverage Δ
opencti	30.84% <91.66%> (+<0.01%)	⬆️
opencti-front	2.47% <ø> (+<0.01%)	⬆️
opencti-graphql	68.21% <91.66%> (-0.01%)	⬇️

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