Update twenty-front commands (#4667)

# This PR

- Moves dev and ci scripts to the `project.json` file in the
twenty-front package
- Adds a project.json file in the root of the project with the main
start command that start both twenty-server and twenty-front
applications concurrently
- Updates the script command of the root project with the start:prod
command (replacing the start command which will be used in dev with the
help of nx)
- Add a start:prod command in the twenty-front app, replacing the start
command (now used for dev purpose)

Issue ref #4645 

@charlesBochet @FelixMalfait please let me know how can I improve it

---------

Co-authored-by: Thaïs Guigon <guigon.thais@gmail.com>

packages/twenty-front/src/modules/search/hooks/__tests__/useFilteredSearchEntityQuery.test.tsx

@@ -72,6 +72,7 @@ describe('useFilteredSearchEntityQuery', () => {
         setCurrentWorkspaceMember({
           id: '32219445-f587-4c40-b2b1-6d3205ed96da',
           name: { firstName: 'John', lastName: 'Connor' },
+          locale: 'en',
         });
 
         const mockObjectMetadataItems = getObjectMetadataItemsMock();