[frontend] fix user context error (#8996)

[marieflorescontact]

Proposed changes

• As there is no context for PublicDashboard, useAuth() was returning error

Related issues

• https://github.com/OpenCTI-Platform/opencti/issues/8996

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)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments

[codecov[bot]]

Codecov Report

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

Project coverage is 66.26%. Comparing base (96bbd5a) to head (ceb2962). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #9004 +/- ## ========================================== - Coverage 66.28% 66.26% -0.03% ========================================== Files 597 597 Lines 61098 61119 +21 Branches 6287 6288 +1 ========================================== - Hits 40501 40500 -1 - Misses 20597 20619 +22 ```

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