bug(mdc-form-field): Label css is duplicated multiple times.

[liesahead]

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

V14

Description

Even in the official (docs) page css is duplicated.

Reproduction

1. Open demo page;
2. Open dev tools;
3. Check the mat-radio or mat-slide-toggle label css in inspector.

Expected Behavior

CSS shouldn't be duplicated.

Actual Behavior

CSS is duplicated.

Environment

Angular CLI: 15.1.6
Node: 18.14.0
Package Manager: yarn 3.3.0
OS: win32 x64

Angular: 15.1.5
... animations, cdk, common, compiler, compiler-cli, core, forms
... language-service, material, platform-browser
... platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.1501.6
@angular-devkit/build-angular 15.1.6
@angular-devkit/build-ng-packagr 0.1002.4
@angular-devkit/core 15.1.6
@angular-devkit/schematics 15.1.6
@angular/cli 15.1.6
@schematics/angular 15.1.6
rxjs 7.8.0
typescript 4.9.5

[wagnermaciel]

Same as #26712

[liesahead]

So, the upgrade to v15 breaks lots of stuff (which takes more than a week to fix after the automatic migration) and it seems that’s how it should be according to your replies 😄

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