[@mantine/core] FloatingArrow: fix Arrow postion

[lawff]

#2506

[rtivital]

Hi @lawff please make sure that:

• Popover component has these changes as well
• floating ui package is updated to the latest version
• you've included stories that can be used for testing Tooltip and Popover components

[lawff]

Hi @lawff please make sure that:

• Popover component has these changes as well
• floating ui package is updated to the latest version
• you've included stories that can be used for testing Tooltip and Popover components

yes, now I

• add the stories in both the Tooltip and Popover components.

• Update the floating UI package to the latest

[rtivital]

Thanks!