[BUG] supplier: create popovers only once

[assynour]

Describe the bug
In the supplier process, when clicking on the button Generate, the process enters in a loop. Currently new popovers are created for the activities retrieve email suggestion and review and adapt email each time the button Generateis clicked.

Expected behavior
The method addInfo (shown below in its current implementation) should first test whether there's already and existing popover attached to the elements.
If so, the popover is shown, otherwise the popover is created.

  protected addInfo(activityId: string) {
    const tippyInstance = this.supplierMonitoring.addInfoOnChatGptActivity(activityId);
    tippyInstance.setProps({
      trigger: 'manual',
      arrow: false,
      hideOnClick: false,
    });
    return tippyInstance;
  }