[backend] Improve application stopping time (#9740)

[aHenryJard]

Proposed changes

• enforce eslint "no floating promise" rule (backend only)
• fix all floating promises on existing code (backend only)

Note: api-test are passing locally (with 01|02) which is not the case on current master so I think it's solving part of end of tests issues, probably proiduction issues too.

Still this PR will requires deep tests.

Related issues

• closes Improve application stopping time #9740

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 69.86301% with 22 lines in your changes missing coverage. Please review.

Project coverage is 65.39%. Comparing base (9276b5a) to head (d47d4eb).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
...tform/opencti-graphql/src/graphql/sseMiddleware.js	0.00%	3 Missing ⚠️
...ti-platform/opencti-graphql/src/http/httpServer.js	0.00%	3 Missing ⚠️
...i-platform/opencti-graphql/src/config/providers.js	0.00%	2 Missing ⚠️
...platform/opencti-graphql/src/database/migration.js	0.00%	2 Missing ⚠️
...opencti-graphql/src/database/sessionStore-redis.js	33.33%	2 Missing ⚠️
...ti-platform/opencti-graphql/src/instrumentation.js	0.00%	2 Missing ⚠️
...rm/opencti-graphql/src/manager/ingestionManager.ts	0.00%	2 Missing ⚠️
opencti-platform/opencti-graphql/src/back.js	0.00%	1 Missing ⚠️
...ti-platform/opencti-graphql/src/database/engine.js	0.00%	1 Missing ⚠️
...pencti-graphql/src/database/sessionStore-memory.js	0.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9715      +/-   ##
==========================================
+ Coverage   65.26%   65.39%   +0.13%     
==========================================
  Files         630      630              
  Lines       60311    60434     +123     
  Branches     6774     6890     +116     
==========================================
+ Hits        39361    39522     +161     
+ Misses      20950    20912      -38     

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[JeremyCloarec]

We can maybe put all the internalProcessNotification from the loop in an array, and resolve them all with a Promise.all outside of the loop?

[richard-julien]

The idea of not puting an await here its to fire and forget the notification without asking the engine to wait for the response. So more interesting for me to add a catch function instead of await

[richard-julien]

Except my command, im ok with the concept.