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:
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### 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

Bắt đầu với các kiểu tiêu đề hộp thoại Angular Material liên kết với directive mat-dialog-title và tái hiện bố cục trong Firefox bằng ví dụ flexbox của issue. Kiểm tra cách pseudo-element :before ảnh hưởng đến justify-content: space-between. Được xem là hoàn tất khi bố cục flex của tiêu đề hộp thoại hoạt động như mong đợi mà không cần thêm container hoặc xóa pseudo-element theo cách thủ công.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.