feat: Add serial backend config for curve25519_dalek_backend

[bakjos]

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What's changed and what's your intention?

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[stdrc]

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[bakjos]

Please add some description. If it's not ready, please mark it as draft.

This is for #15722 (comment), and still not working, could you add the label ci/run-e2e-single-node-tests? because I can not see the failing reason