Demo company records across many country localization modules are now consistently identified as companies. This improves the reliability of sample data used for testing, demonstrations, and onboarding in localized Odoo setups.

Set the field "is_company" to True on each loca demo companies.

Backport of https://github.com/odoo/odoo/pull/190699

task-4310530

The HSN code field now appears immediately after the product field in POS order lines. This makes it easier for users handling Indian localization workflows to review product tax classification details in context.

In this commit:
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- Move `l10n_in_hsn_code` field in the order lines view to appear after the `product_id` field.

task-4432432