bug(all): Strong focus indicators should only show when the user uses the keyboard to navigate

### 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

https://v12.material.angular.io/guide/theming#strong-focus-indicators

### Reproduction

reproduces in the trivial case

### Expected Behavior

According to guidance we've received from the Material Design team, focus indicators are only expected to be visible when the user has used the keyboard to focus the item

### Actual Behavior

Focus indicators are showing on click

### Environment

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

Beginne mit dem verlinkten Leitfaden „Strong focus indicators“ und bilde den Unterschied zwischen Klicken und Tastaturnavigation im trivialen Fall nach. Erledigt bedeutet, dass Fokusindikatoren nach der Tastaturnavigation, aber nicht nach einem Klick erscheinen.

Vom Indexierungsmodell aus dem Issue-Text verfasst.