Connect - Relation on FE Importer (#13213)

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

packages/twenty-front/src/modules/object-record/utils/sanitizeRecordInput.ts

@@ -42,18 +42,10 @@ export const sanitizeRecordInput = ({
         if (
           isDefined(fieldMetadataItem) &&
           fieldMetadataItem.type === FieldMetadataType.RELATION &&
-          fieldMetadataItem.relation?.type === RelationType.MANY_TO_ONE
+          fieldMetadataItem.relation?.type === RelationType.MANY_TO_ONE &&
+          !isDefined(recordInput[fieldMetadataItem.name]?.connect?.where)
         ) {
-          const relationIdFieldName = `${fieldMetadataItem.name}Id`;
-          const relationIdFieldMetadataItem = objectMetadataItem.fields.find(
-            (field) => field.name === relationIdFieldName,
-          );
-
-          const relationIdFieldValue = recordInput[relationIdFieldName];
-
-          return relationIdFieldMetadataItem
-            ? [relationIdFieldName, relationIdFieldValue ?? null]
-            : undefined;
+          return undefined;
         }
 
         if (