[backend] Improve connection drop handling for importCSV connector (#6314)

[JeremyCloarec]

Proposed changes

Some of the connection errors on rabbitMQ are sent to the 'close' event and not in the 'error' event. We added an handler for the 'close' event to be able to reconnect to rabbitMQ when possible

Related issues

#6314

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 67.68%. Comparing base (7b0bcf3) to head (cc213e9).

Files	Patch %	Lines
...hql/src/connector/importCsv/importCsv-connector.ts	0.00%	8 Missing ⚠️
...-platform/opencti-graphql/src/database/rabbitmq.js	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6533      +/-   ##
==========================================
- Coverage   67.69%   67.68%   -0.01%     
==========================================
  Files         532      532              
  Lines       65010    65022      +12     
  Branches     5445     5445              
==========================================
+ Hits        44008    44010       +2     
- Misses      21002    21012      +10     

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