Set `TextLayoutInfo::scale_factor` in `update_text_layout_info` (#24245)

# Objective
* `TextLayoutInfo::scale_factor` should be set during
`update_text_layout_info` with the value taken from the parley `Layout`,
responsibility should not be with the caller.
* `TextLayoutInfo::size` is scaled to be in logical pixels, this isn't
consistant with other UI layout values that are kept in physical pixels.

## Solution

* Update `TextLayoutInfo::scale_factor` in `update_text_layout_info`
with the value taken from the parley `Layout`.
* Remove the lines updating `scale_factor` and scaling `size` from the
text2d and UI text systems.