bug(material/tabs): tab body height animation is broken

### 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

You can even see this behaviour in the tab example in the docs https://material.angular.dev/components/tabs/examples
scroll down to the "Tab group that keeps its content inside the DOM when it's off-screen." example
it instantly hides the first tab content when u click the second, instead of waiting for the animation to complete, leading to a glitchy stutter

### Reproduction

look at angular material's own docs ^

### Expected Behavior

it should keep the content showing until the animation is completely done

### Actual Behavior

it glitches and hides instantly

### Environment

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

Reproduziere das Problem im Beispiel „Tab group that keeps its content inside the DOM when it's off-screen“ in der Angular Material-Dokumentation. Beginne damit, die Animation der Höhe des Tab-Inhaltsbereichs und das Verhalten der Inhaltsanzeige beim Wechseln zwischen Tabs nachzuverfolgen. Die Aufgabe ist erfüllt, wenn der Inhalt des vorherigen Tabs sichtbar bleibt, bis seine Animation abgeschlossen ist, ohne die gemeldeten Ruckler.

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