troubleshooting(dialog): Dialog title :before psuedo element

### 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

We are doing a migration to Material Angular 16 and when attempting to style the `mat-dialog-title` of a dialog. There is a `:before` pseudo element which has an empty string as content, and I believe the purpose of this element is to set the height of the title element with the `mat-dialog-title` directive. Is this correct? This implementation seems very hacky to me and flexbox `justify-content` does not work property because this pseudo element is considered an element within a flex container, and therefore the developer either needs to create a new flex container within the `mat-dialog-title` or remove the content from the `:before` psuedo element. Am I not not thinking of this correctly and is there another way to use `justify-content` which works with this psuedo element?

### Reproduction

StackBlitz link:
Steps to reproduce:
1.
2.

### Expected Behavior

If the `mat-dialog-title` container is a flex container, `justify-content: space-between` works correctly.

### Actual Behavior

`justify-content: space-between` adds space between the psuedo element which has an empty string as content and the next element within the `mat-dialog-title`

### Environment

- Angular: 16.2.10
- CDK/Material: 16.2.9
- Browser(s): Firefox
- Operating System (e.g. Windows, macOS, Ubuntu): macOS

Inizia con gli stili del titolo della finestra di dialogo di Angular Material associati alla direttiva mat-dialog-title e riproduci il layout in Firefox usando l’esempio di flexbox dell’issue. Verifica in che modo lo pseudo-elemento :before influisce su justify-content: space-between. Il lavoro è completato quando il layout flex del titolo della finestra di dialogo si comporta come previsto senza richiedere un contenitore aggiuntivo né la rimozione manuale dello pseudo-elemento.

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