fix(modal): prevent card modal animation on viewport resize when modal is closed (#30894)

Issue number: resolves #30679

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## What is the current behavior?
When a page contains a card modal with a `presentingElement`, resizing
the viewport (e.g., rotating from portrait to landscape) triggers the
card modal's "lean back" animation on the presenting element, even when
the modal has never been opened.

## What is the new behavior?
Viewport resize events no longer trigger the presenting element
animation when the modal is not presented. The animation only runs when
the modal is actually open.

## Does this introduce a breaking change?

- [ ] Yes
- [X] No

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## Other information

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screenshots of how the component looks before and after the change. -->

Current dev build:
```
8.7.16-dev.11767028735.16932cea
```