bug(mat-form-field): VoiceOver reads multiple group, set aria-hidden to supporting elements

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

related to #32797

Supporting elements in `MatFormField` should have `aria-hidden="true"` here because they do not contribute to accessibility. I suggest the "Ripple" family of components, in this case selector `matformfieldlineripple` but also in all other places, to automatically add `aria-hidden="true"`.

If hints and errors are empty, `MatFormField` still renders a hint wrapper, which then would read as an empty "group". In this case, this wrapper should also be "aria-hidden="true".

### Reproduction

StackBlitz link: https://stackblitz.com/edit/components-issue-starter-cudkchbv?file=src%2Fmain.ts
Steps to reproduce:
1. enable VoiceOver
2. navigate through elements

### Expected Behavior

At best, it should should skip the first "input", directly read "Input, edit text" and after that "test"

### Actual Behavior

VoiceOver is reading the following at each navigation step:
1. Input
2. Input, edit text
3. group
4. group

### Environment

- Angular: tested with 18 and 20
- CDK/Material: tested with 18 and 20
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): macOS 26

Beginne mit der verlinkten StackBlitz-Reproduktion und der MatFormField-Implementierung und konzentriere dich dabei auf die unterstützenden Elemente und den im Bericht beschriebenen matformfieldlineripple-Selektor. Prüfe, wie leere Hint- und Error-Inhalte den Hint-Wrapper erzeugen, und verifiziere anschließend mit VoiceOver, dass nicht beitragende Elemente übersprungen werden und der erwartete Input- und Testtext hörbar bleibt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.