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
• Components: add placement prop to replace position in RangeControl #70326
• Warning: Replace popoverProps.position to popoverProps.placement #70347
• Social Link: Use placement prop for popover positioning #70348
• Media List: Use 'placement' prop for popover positioning #70350
• Circular Option Picker: Use 'placement' prop for popover positioning #70359
• Any leftover position={ or position: props:
  • tooltipPosition prop (ie. Button component)