This PR addresses [#36593](https://github.com/servo/servo/issues/36593),
where the poster image request for `<video>` elements lacked several
settings introduced in `RequestBuilder`. These settings —
`insecure_requests_policy`, `has_trustworthy_ancestor_origin`, and
`policy_container` — are now forwarded from the document, aligning
poster requests with other fetches using the correct policy container
and trust assessment.
This ensures that poster images are requested under the same security
assumptions as other media or resource loads.
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- [X] `./mach build -d` does not report any errors
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- [X] These changes fix#36593
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Signed-off-by: Emmanuel Elom <elomemmanuel007@gmail.com>
Co-authored-by: Josh Matthews <josh@joshmatthews.net>
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