bug(style): Custom palette's text hue not propagated to MDC styles

### Is this a regression?

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

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

14.x

### Description

[Re-opening #26021 which was incorrectly closed as a duplicate of a similar but different issue]

[This is a regression insofar as the legacy non-MDC implementations do not have this problem]

Hi, after running the MDC schematic on one of my projects I have found that the MDC-based components do not use the `$text` hue specified in the theme config, which can cause accessibility issues for themes whose default hues do not provide sufficient contrast against a neutral background. In particular I have noticed this causes legibility issues for the floating placeholder on form fields and the label text on default-appearance buttons, but it might apply to other components as well.

My theme is configured as follows:

`$my-palette: mat.define-palette($greens, 600, 200, 900, 700);`
Note that the $text hue is overridden to `700` in the call to `define-palette`.

Here is a screenshot showing the 700 hue being correctly applied to the aforementioned text elements under the legacy components:


And here is how the new MDC components look:


I had a hard time reading the Angular Material => MDC SCSS theming code but it seems like the $text hue preference isn't being passed to the MDC mixins in any way.

### Reproduction

StackBlitz link:
Steps to reproduce:
1. https://stackblitz.com/edit/components-issue-9ugktp?file=src%2Fstyles.scss
2. Note that text hue is set to 900 but text button and form field label use 500

### Expected Behavior

MDC components should use specified text hue where applicable

### Actual Behavior

MDC components used primary hue regardless

### Environment

Environment
Angular: 15.0.0-18.0.1
CDK/Material: 15.0.0-18.0.1
Browser(s): Chrome
Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

Bắt đầu với src/styles.scss trong StackBlitz được liên kết và lần theo mã tạo kiểu SCSS của Angular Material MDC xung quanh mat.define-palette và các MDC mixin. So sánh đầu ra legacy và MDC cho sắc độ $text đã cấu hình, sau đó xác minh rằng các phần tử văn bản MDC áp dụng được, bao gồm nhãn trường biểu mẫu và các nút mặc định, sử dụng sắc độ được chỉ định trong bản tái hiện.

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