refacto(invite|signin): remove unused code + fix signin on invite page. (#9745)

- Replace `window.location.replace` by `useRedirect` hook.
- Remove unused code: `switchWorkspace, addUserByInviteHash...`
- Refacto `Invite` component.
- Fix signin on invite modal.

packages/twenty-front/src/modules/workspace-member/graphql/mutations/addUserToWorkspace.ts

@@ -1,9 +0,0 @@
-import { gql } from '@apollo/client';
-
-export const ADD_USER_TO_WORKSPACE = gql`
-  mutation AddUserToWorkspace($inviteHash: String!) {
-    addUserToWorkspace(inviteHash: $inviteHash) {
-      id
-    }
-  }
-`;

packages/twenty-front/src/modules/workspace-member/graphql/mutations/addUserToWorkspaceByInviteToken.ts

@@ -1,9 +0,0 @@
-import { gql } from '@apollo/client';
-
-export const ADD_USER_TO_WORKSPACE_BY_INVITE_TOKEN = gql`
-  mutation AddUserToWorkspaceByInviteToken($inviteToken: String!) {
-    addUserToWorkspaceByInviteToken(inviteToken: $inviteToken) {
-      id
-    }
-  }
-`;