[backend] Fix connectors work cleanup perf (#6031)

[SouadHadjiat]

Proposed changes

• Retrieve only needed fields
• Add sort by timestamp since there is no standard_id in Work objects.

Related issues

• Errors related to Elasticsearch engine pagination.(CVE Connector error) #6031

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

Need help to test this change.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 66.74%. Comparing base (932c5d0) to head (252df52).

Files	Patch %	Lines
...rm/opencti-graphql/src/manager/connectorManager.js	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6203      +/-   ##
==========================================
- Coverage   66.74%   66.74%   -0.01%     
==========================================
  Files         541      541              
  Lines       64553    64559       +6     
  Branches     5306     5307       +1     
==========================================
+ Hits        43088    43090       +2     
- Misses      21465    21469       +4     

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