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/auth/states/workspaces.ts

@@ -5,9 +5,9 @@ import { Workspace } from '~/generated/graphql';
 export type Workspaces = Pick<
   Workspace,
   'id' | 'logo' | 'displayName' | 'subdomain'
->;
+>[];
 
-export const workspacesState = createState<Workspaces[] | null>({
+export const workspacesState = createState<Workspaces>({
   key: 'workspacesState',
   defaultValue: [],
 });