[FIX] account_edi: better locking of documents and other models when processing EDI

- On account_edi_document, lock the documents successively instead of all at once.
- Lock account_move that should be cancelled. Before, cancelling the invoice after cancelling it on the web-service could fail.
- Lock ir_attachment that might be unlinked. Before, attachments that weren't attached to any model could become unreachable but still present in the database when an invoice was cancelled or a new attachment was produced.

closes odoo/odoo#64870

Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>

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