Popover: refactor all usages of the legacy position prop to the placement prop

[ciampo]

After #40740, there are two different props in the Popover component to affect is position: position (legacy) and placement (new)

In order to deprecate the legacy position prop from the Popover component, we should first migrate all current usages to the new placement prop:

• Block switcher preview Popover: use new placement prop instead of legacy position prop #44387
• LinkControl: use Popover new placement prop instead of legacy position prop in README #44388
• Format Toolbar Popover: use new placement prop instead of legacy position prop #44389
• URL Input Popover: use new placement prop instead of legacy position prop #44390
• Button block Popover: use placement prop instead of legacy position prop #44392
• Navigation Link Popover: use placement prop instead of legacy position prop #44394
• Navigation Submenu Popover: use placement prop instead of legacy position prop #44395
• Autocompleter Popover: use placement prop instead of legacy position prop #44396
• Image format popover: use placement prop instead of legacy position prop #44398
• Link format Popover: use placement prop instead of legacy position prop #44399
• remove position from Popover's storybook
• consider exporting the position-to-placement converstion utility for URLPopover, Dropdown, Tooltip and DotTip
• URLPopover: use new placement prop instead of legacy position prop #44391
• Dropdown (requires deprecating position in favour of popoverProps.placement, Dropdown: the position prop is made redundant by popoverProps #46858) Dropdown: deprecate position prop, use popoverProps instead #46865
• Tooltip (requires deprecating position in favour of placement too) Tooltip: add placement prop to replace deprecated position #54264
• Any leftover position={ or position: props:
  • tooltipPosition prop (ie. Button component)

[annezazu]

It looks like the majority of work planned here has been completed. Closing this out as a result but happy to reopen if that's incorrect!

[ciampo]

@annezazu I think the issue could still be relevant, I'd love to get to complete the missing tasks if possible. Let's keep it open for now, and see if we can get to (at least) some of those