Exclude database migrations from Codacy analysis #766

Goal\nExclude database migration code from Codacy static analysis.\n\n## Current state\n.codacy.yml currently excludes HealthMonitoring/Migrations/**, but migration directories or generated migration files in other projects may still be analyzed.\n\n## Requirements\n- Identify all database migration directories and generated migration files in the repository.\n- Add the narrowest appropriate Codacy exclusions for all migration code.\n- Keep application and non-generated data-access code included in analysis.\n- Verify the Codacy configuration remains valid and migration files are excluded.