feat: Enhance configuration handling and UI for job management

- Update .gitignore to include new provider files and ensure proper tracking.
- Refactor job and config forms to support multiple configuration selections, improving user experience.
- Implement logic to handle the initialization of skipProcessedFiles with a default value.
- Add new provider form templates for better organization and management of source and destination configurations.
- Enhance tests for provider forms and job configurations to ensure robust functionality.
- Introduce nullable handling for skipProcessedFiles in the database schema and update related migrations.
- Improve error handling and validation in job creation and editing processes.

internal/db/migrations/migrations.go

@@ -14,6 +14,7 @@ func InitMigrations(db *gorm.DB) *gormigrate.Gormigrate {
 		AddSkipProcessedFilesColumn(),
 		AddMaxConcurrentTransfersColumn(),
 		AddMultiConfigSupport(),
+		UpdateSkipProcessedFilesToNullable(),
 	}
 
 	return gormigrate.New(db, gormigrate.DefaultOptions, migrations)