[frontend] fetch creators on observable creation & add default author (#8686)

[delemaf]

Proposed changes

• On observable creation, creators are now fetched after creation
• Added some typings to StixCyberObservableCreation and removed useless undefined props

Related issues

• Close https://github.com/OpenCTI-Platform/opencti/issues/8686

Checklist

• [x] I consider the submitted work as finished
• [x] 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)
• [x] Where necessary I refactored code to improve the overall quality

Further comments

I've added objectOrganization to me object in useAuth if it may be use anywhere else

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.82%. Comparing base (d3a85de) to head (ebd3d20). Report is 9 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #9056 +/- ## ========================================== + Coverage 64.68% 64.82% +0.13% ========================================== Files 620 620 Lines 59208 59279 +71 Branches 6520 6862 +342 ========================================== + Hits 38301 38425 +124 + Misses 20907 20854 -53 ```

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