astro:assets cannot be used with Collections frontmatter data

[LexSwed]

What version of astro are you using?

2.5.6

Are you using an SSR adapter? If so, which one?

Vercel

What package manager are you using?

npm

What operating system are you using?

Mac

What browser are you using?

Chrome

Describe the Bug

After #7139 cover image in frontmatter will have all props of an imported image, including absolute src path, not allowing to combine it with astro:assets <Image> component.

This makes this part that covers how to use frontmatter images with <Image> incorrect.

 `Image`'s and `getImage`'s `src` parameter must be an imported image 
or an URL, it cannot be a filepath. Received 
`/@fs/project/sandbox/src/assets/cat.jpg?origWidth=640&origHeight=427&origFormat=jpg`.

Link to Minimal Reproducible Example

https://codesandbox.io/p/sandbox/cranky-violet-86he43?file=%2Fsrc%2Fpages%2Findex.astro%3A13%2C1

Participation

• I am willing to submit a pull request for this issue.

[LexSwed]

Had incorrect usage of frontmatter, passing cover.src instead of just cover:

<Image src={post.data.cover} alt="a cat" />