fix(Textfield): Disable word-wrapping inside prefix and suffix (#2177)

## Description
We encountered an
[issue](Altinn/altinn-studio#13167) in Altinn
Studio when we added prefix and suffix to the Textfield component. When
a text inside a prefix/suffix contains a hyphen, a line break is created
and the container overflows vertically.

The issue can be solved by adding `white-space: nowrap` to the prefix
and suffix classes.

## Screenshots
This is from testing in local Storybook.

**Before**:

![prefix-before](https://github.com/user-attachments/assets/06f7e613-9552-4e94-b28f-78520193f11d)


**After**:

![prefix-after](https://github.com/user-attachments/assets/f96aec9f-71e7-4df5-9ee1-24fbfe00c4d2)

packages/css/textfield.css

@@ -131,12 +131,14 @@
   border-right: 0;
   border-top-right-radius: 0;
   border-bottom-right-radius: 0;
+  white-space: nowrap;
 }
 
 .ds-textfield__suffix {
   border-left: 0;
   border-top-left-radius: 0;
   border-bottom-left-radius: 0;
+  white-space: nowrap;
 }
 
 .ds-textfield__readonly__icon {