[Frontend] Remove FF for Public dashboards in workspace header

[CelineSebe]

Proposed changes

Related issues

Checklist

• [ ] I consider the submitted work as finished
• [ ] 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 64.63%. Comparing base (3553065) to head (3ad0583). Report is 4 commits behind head on release/6.4.0.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/6.4.0 #9005 +/- ## ================================================= + Coverage 64.61% 64.63% +0.02% ================================================= Files 614 614 Lines 58862 58878 +16 Branches 6475 6502 +27 ================================================= + Hits 38031 38055 +24 + Misses 20831 20823 -8 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.