[Shopify] Sync tax registration ID from Shopify company to BC customer

[onbuyuka]

Summary

When creating or updating a BC Customer from a Shopify Company, the Tax Registration ID from the Company Location is now automatically synced to the Customer record based on the shop's tax ID mapping configuration.

Changes

Feature Implementation

• Interface: Added UpdateTaxRegistrationId method to Shpfy Tax Registration Id Mapping interface
• Registration No. mapping: Updates Customer."Registration Number" field
• VAT Registration No. mapping: Updates Customer."VAT Registration No." field (with automatic truncation to field max length)

Integration Points

• Shpfy Create Customer: Now calls UpdateTaxRegistrationId when creating a customer from a company
• Shpfy Update Customer: Now calls UpdateTaxRegistrationId when updating a customer from a company

Work Item(s)

Fixes AB#616952