[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.

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 57.62712% with 25 lines in your changes missing coverage. Please review.

Project coverage is 64.29%. Comparing base (d695e99) to head (292a884).
Report is 3 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 ⚠️
...i-platform/opencti-graphql/src/database/session.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 ⚠️
...orm/opencti-graphql/src/lock/child-lock.manager.ts	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 ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9715      +/-   ##
==========================================
- Coverage   64.29%   64.29%   -0.01%     
==========================================
  Files         655      655              
  Lines       62938    62941       +3     
  Branches     6969     6967       -2     
==========================================
- Hits        40469    40468       -1     
- Misses      22469    22473       +4     

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[richard-julien]

Except my command, im ok with the concept.