Previously, if you enabled presigned URL downloads for a collection, all
the files would use them. However, it might be possible that you want to
use presigned URLs only for specific files (like videos), this PR allows
you to pass `shouldUseSignedURL` to control that behavior dynamically.
```ts
s3Storage({
collections: {
media: {
signedDownloads: {
shouldUseSignedURL: ({ collection, filename, req }) => {
return req.headers.get('X-Disable-Signed-URL') !== 'false'
},
},
},
},
})
```
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