This change removes sample company data and partner tax IDs from the Mexico reports module because they are no longer needed. It keeps demo information simpler and better aligned with current Mexico localization requirements, with no expected impact on normal users.

- demo data for companies no longer needed because a specific company in Mexico
  is already added.
- partner VATs removed because it's not required for foreign partners

X-original-commit: dc9c047130574ef01b18907897ea96f295227931