refacto(*): remove everything about default workspace (#9157)

## Summary
- [x] Remove defaultWorkspace in user
- [x] Remove all occurrence of defaultWorkspace and defaultWorkspaceId
- [x] Improve activate workspace flow
- [x] Improve security on social login
- [x] Add `ImpersonateGuard`
- [x] Allow to use impersonation with couple `User/Workspace`
- [x] Prevent unexpected reload on activate workspace
- [x] Scope login token with workspaceId 

Fix https://github.com/twentyhq/twenty/issues/9033#event-15714863042

packages/twenty-front/src/modules/auth/graphql/queries/checkUserExists.ts

@@ -6,7 +6,6 @@ export const CHECK_USER_EXISTS = gql`
       __typename
       ... on UserExists {
         exists
-        defaultWorkspaceId
         availableWorkspaces {
           id
           displayName