Use builtin number validation (#8819)

The regex approach doesn't work great for the many different number
formats. Even a simple decimal failed e.g. '1.1' was considered invalid.
I've switched this over to use javascripts builtin conversion and
validation. This now supports other formats e.g. '-1.0e15' would now be
considered valid.

Closes: #8820

packages/twenty-front/src/modules/object-record/spreadsheet-import/utils/getSpreadSheetFieldValidationDefinitions.ts

@@ -33,9 +33,9 @@ export const getSpreadSheetFieldValidationDefinitions = (
     case FieldMetadataType.Number:
       return [
         {
-          rule: 'regex',
+          rule: 'function',
-          value: '^\\d+$',
+          isValid: (value: string) => !isNaN(+value),
-          errorMessage: fieldName + ' must be a number',
+          errorMessage: fieldName + ' is not valid',
           level: 'error',
         },
       ];