[backend] Improve objects resolutions event loop usage for large report (#6638)

[richard-julien]

See #6638

[codecov]

Codecov Report

Attention: Patch coverage is 87.17949% with 5 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (master@9ccc098). Click here to learn what that means.
Report is 2 commits behind head on master.

Files	Patch %	Lines
...latform/opencti-graphql/src/database/middleware.js	85.29%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6640   +/-   ##
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  Coverage          ?   67.70%           
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  Files             ?      532           
  Lines             ?    65158           
  Branches          ?     5464           
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  Hits              ?    44112           
  Misses            ?    21046           
  Partials          ?        0           

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[ckane]

I have deployed this fix to my instance as well. Initial testing looking good.

[ckane]

This fix cleared the worker backlog. I am re-enabling the DigitalSide.it misp-feed connector instance now to see how that works.

[ckane]

Looks like it's fixed, thanks @richard-julien!