feat(mat-form-field): Outlined form filed container color

### Feature Description

I need to use the Outlined mat form field, but I can't set the container color with a token... I need to use internal classes. That is very frustrating because we are investing in using these tokens and removing the use of internal classes.

### Use Case

_No response_

Start by locating the Angular Material outlined mat-form-field theming and token definitions, then compare them with the internal classes currently needed to set the container color. Confirm the public token behavior and existing theming tests before defining the change; done means the outlined container color can be configured without relying on internal classes.

Scritto dal modello di indicizzazione a partire dal testo della issue.