Users now can make a back transition from the current step state. - Added a `BackButton` component to `spreadsheet-import` in order to use it within the step state components. - Used the prebuilt `prevStep` from `useStepBar` and passed it as a prop to the `Uploadflow` to get the previous state as activestep. - Added a `previousState` to set the previous state with the required key data. - Added a `handleOnBack` function in `Uploadflow` to set the correct state and call the `prevStep` function to make the transition. - Added a callback function `onBack` and passed it as props to each step state component. fixes: #5564 https://github.com/twentyhq/twenty/assets/140178357/be7e1a0a-0fb8-41f2-a207-dfc3208ca6f0 --------- Co-authored-by: Thomas Trompette <thomas.trompette@sfr.fr>