Data with letters can be pasted into Input fields with a number formatting

### Description of the bug

When testing an Input component with a number formatting and suffix I was able to paste in data that had a letters in it which meant that instead of only saving the numerical part of the data pasted it also saved the letters.

### Steps To Reproduce

1. Add an Input field to the form with the following properties:
```json
"formatting": {
"number": {
"suffix": " liter"
}
```
2. The dataModelBinding of the Input field should refer to a field that is a `string`.
3. Copy some some data such as "20 liter" and paste it into the field.
4. See that the string "20 liter" is saved instead of only "20".

### Additional Information

Here is a video showing the bug:
https://github.com/user-attachments/assets/d4bc0d73-1f36-4f9a-af05-f0da14623dd5

Start at the Input component's number-formatting and paste-handling entry points, using the reproduction configuration in the issue. Reproduce by pasting "20 liter" into a string-bound field with the " liter" suffix, then verify that only "20" is saved. Add regression coverage wherever the Input formatting behavior is tested.

Written by the indexing model from the issue text.