Replaced Edit Floating Action Buttons for Threats

[Bonsai8863]

Proposed changes

Replace the floating action button for editing threats with a dedicated button in the top right the page.

Related issues

• https://github.com/OpenCTI-Platform/opencti/pull/6738
• https://github.com/OpenCTI-Platform/opencti/pull/6756
• https://github.com/OpenCTI-Platform/opencti/pull/7032

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality
• [x] 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