Angular Material Radio button - Ripple effect persists until clicking away.

### Which @angular/* package(s) are the source of the bug?

Don't known / other

### Is this a regression?

Yes

### Description

Clicking on a radio button now persists the ripple effect. This issue seems to have appeared since Angular 11 and still exists in Angular 12. This bug can be seen in angular material documentation.

Angular 10. No persistent ripple.
https://v10.material.angular.io/components/radio/overview

Angular 11. Persistent ripple issue which clears after clicking somewhere on the screen
https://v11.material.angular.io/components/radio/overview

Although not perfect I've added the following css to hide the bug as a workaround.

`
.mat-radio-button:not(.mat-radio-disabled).cdk-program-focused .mat-radio-persistent-ripple {
opacity: 0;
}
`

I couldn't find a ticket regarding this issue so thought it's worth raising one.

### Please provide a link to a minimal reproduction of the bug

https://v11.material.angular.io/components/radio/overview

### Please provide the exception or error you saw

_No response_

### Please provide the environment you discovered this bug in

_No response_

### Anything else?

_No response_

Issue にリンクされている Angular Material のラジオボタンの例から始め、Angular 10 と Angular 11 の動作を比較して回帰の原因を切り分けます。ラジオボタンを選択した後も ripple が残り続ける状態を再現し、ドキュメントの例を含め、別の場所をクリックしなくても ripple が消えることを確認します。

索引モデルが issue の本文から書いたものです。