Dot Tip: Use new placement prop instead of legacy position prop

[himanshupathak95]

What?

Part of #44401

Use the new placement prop instead of the legacy position prop to define the Popover's placement when it is opened.

Why?

With the recent refactoring of the Popover component to floating-ui, we're in the process of refactoring all of its usages to the new placement prop (native to floating-ui). See #44401 for more details

How?

Swap position with the new corresponding placement.

See this conversion table that we're currently using to map position values to placement values.

Testing Instructions

Screenshots or screencast

Before	After

[Mamaduka]

@himanshupathak95, the nux package is deprecated. I am not sure if there are any benefits to shipping enhancements for deprecate pages or components.

[himanshupathak95]

Thanks @Mamaduka for the suggestion. I was unaware of the nux package being depreacted. In that case, maybe we can focus on other issues and close this.