chore(backend): estimate ILP quote receive amount, and fail early

[mkurapov]

Changes proposed in this pull request

Error during quoting if the ILP quote will not fulfil at least a single unit of the receiving asset. See #2770 for detailed explanation.

Context

Fixes #2770

Checklist

• [x] Related issues linked using fixes #number
• [ ] Tests added/updated
• [ ] Documentation added
• [ ] Make sure that all checks pass
• [ ] Bruno collection updated

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