bug(MatList): Icons do not respect RTL direction

### 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

When using MatList in an RTL project, the icons do not adjust their margins correctly based on the text direction (dir="rtl"). The left and right margins remain the same as in LTR mode, causing misalignment in RTL layouts.

I was able to fix this issue easily with custom CSS, but I wanted to report it as a bug in case it needs to be addressed in the library.

### Reproduction

StackBlitz link:
Steps to reproduce:
1.
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### Expected Behavior

Icons should switch their margins correctly when dir="rtl" is set.

### Actual Behavior

Icons remain aligned as if the project is LTR, leading to incorrect spacing.

### Environment

Angular: 18
Angular Material: 19.1.5
Browser: Latest version of Chrome
Operating System: Windows (running a Linux dev container on WSL)

Comienza reproduciendo el problema del espaciado del icono de MatList en un proyecto de Angular 18 usando Angular Material 19.1.5, con dir="rtl" y la última versión de Chrome. Compara los márgenes y la alineación del icono en RTL y LTR; el issue está terminado cuando el espaciado del icono sigue correctamente la dirección del texto.

Escrito por el modelo de indexación a partir del texto del issue.