Evaluate and consolidate `useMergedRefs` helpers

[tay1orjones]

There's been a useMergedRefs helper in the codebase for quite a while.

https://github.com/carbon-design-system/carbon/blob/ab9cd8c843d64427f496ac4ca781e165a3d07d2e/packages/react/src/internal/useMergedRefs.ts#L10-L26

With the addition of floating-ui we now have access to it's helper by the same name. This brings up a few things to consider:

• Are these helpers equivalent?
• Should we use the floating-ui one and remove our internal one?
• Would we prefer to instead remain using our own and add an eslint rule to help enforce not using the floating-ui one?

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