I’ve added a new launch darkly flag to toggle between the new and old
block menu in the builder.
### Changes 🏗️
- A new flag name `NEW_BLOCK_MENU` has been added.
- A new block menu block has been created, which is a normal component.
It will be expanded with more components in the future. Currently, it’s
just a one-line component.
- A new control panel has been created, which improves state
localisation and has a new design according to the design files.
<img width="1512" height="981" alt="Screenshot 2025-08-18 at 2 49 54 PM"
src="https://github.com/user-attachments/assets/3deeefe3-9e42-4178-9cf9-77773ed7e172"
/>
### Checklist 📋
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
- [x] Everything works perfectly on local.