Various fixes required to pass certification

[bob2021]

This MR addresses issues discovered during FedEx certification testing, including schema updates, generator improvements, and fixes for trade document upload endpoints.

Upstream Schema Updates

• Updated all OpenAPI schemas from FedEx's latest specifications
• Changes to account registration, consolidation, rates/transit times, and ship APIs

Ship V1

• Remove totalWeight from RequestedShipment.required
• Remove accountNumber from ResponsiblePartyParty.required
• Remove commercialInvoice from CustomsClearanceDetail.required
• Remove tinType from TaxpayerIdentification.required
• Fix TransactionCreateShipmentOutputVO.alerts anyOf definition that caused fallback to associative array

Trade Documents Upload V1

• File attachments now include proper filenames in Content-Disposition headers
• Multi-file uploads handled as separate multipart entries instead of JSON arrays
• Add test covering uploadEtdFiles, imageUploadServiceInfo, uploadMultiEtDfiles

Generator Improvements

• Add delete-array-values action type for schema modifications to avoid full replace
• Fix inline object schema collision: inline objects with property names matching existing components no longer silently overwrite the actual component schema. These are now extracted as Contact_2, etc and de-duplicated when possible.

[colinmollenhour]

Looks good to me!