[2515] existing migration deployment

[strongmindsaln]

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[Copilot]

Pull request overview

This PR updates the database migration deployment script to better handle existing databases during the EF6 → EF Core migration transition, by pre-marking an additional EF Core migration as applied and adjusting how the generated SQL is written to disk for sqlcmd.

Changes:

• Pre-mark AddExternalAndInternalPaymentOrganizationUnits_ToContractReadModel in __EFMigrationsHistory when the target schema already contains the expected column(s).
• Write the temporary initialization SQL file without a UTF-8 BOM to avoid sqlcmd parsing issues on some environments.