This update enhances the user experience by providing clearer placeholders for Peppol identifiers and automatically verifying this information when key data changes. A new feature has been added specifically for Belgium, leveraging the VAT number to streamline the Peppol identifier process through the company registry endpoint. This improves data accuracy and simplifies integration for Belgian businesses.

This commit improves the UX by displaying more intuitive placeholders
for the peppol identifier. The peppol information is also automatically
verified when important data changes.

It also adds a special case for Belgium in which we try to use the vat
number as the peppol identifier with the company registry endpoint.

task: 5172378