account_invoice_import_llm: Import taxes properly

Right now, when an invoice is imported, the tax gets imported as an adjustment. Would it be possible to import it as a tax instead?

Here's an example invoice:

This is how it gets imported:

There's a warning at the top of the page saying that the tax was forced to $0:

Which is thrown here: https://github.com/OCA/edi/blob/904784f05d5e640aedee5c88dacffe7c7114e046/account_invoice_import/wizard/account_invoice_import.py#L1083