Done : - Relation connect on FE Importer - Remove templating on SpreadsheetMatchedColumn type - Remove useless files on import - Remove AvailableFieldsForImport type + Update SpreadsheetImportField type and SpreadsheetImportFieldOption To test : - Try import opportunities on Apple wk [using this file](https://github.com/user-attachments/files/21233720/Test.import.-.opportunities-sample.csv) closes : https://github.com/twentyhq/core-team-issues/issues/1090