Add westend system chains as a trusted teleporters (#7787)

Asset Hub Next has been deployed on Westend as parachain 1100, but it's
not yet a trusted teleporter.
This minimal PR adds it in stable2412 so that it can be deployed right
away without waiting for the rest of the release to be finalised and
deployed.

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>