Fix unique index created twice (#7718)

`isUnique` was passed to TypeORM's column creation API resulting in
double index creation because it's already done via the decorator and
then in `WorkspaceMigrationIndexFactory`

It would be interesting to move it at this field level in a later step,
which is why I also fixed `CompositeColumnActionFactory` to pass
isUnique on the correct columns, even though it's being ignored later on

packages/twenty-server/src/engine/metadata-modules/workspace-migration/factories/composite-column-action.factory.ts

@@ -183,7 +183,10 @@ export class CompositeColumnActionFactory extends ColumnActionAbstractFactory<Co
           enum: enumOptions,
           isNullable:
             alteredFieldMetadata.isNullable || !alteredProperty.isRequired,
-          isUnique: alteredFieldMetadata.isUnique ?? false,
+          isUnique:
+            (alteredFieldMetadata.isUnique &&
+              alteredProperty.isIncludedInUniqueConstraint) ??
+            false,
           defaultValue: serializedDefaultValue,
           isArray:
             alteredProperty.type === FieldMetadataType.MULTI_SELECT ||

packages/twenty-server/src/engine/workspace-manager/workspace-migration-runner/workspace-migration-runner.service.ts

@@ -402,7 +402,10 @@ export class WorkspaceMigrationRunnerService {
         enumName: enumName,
         isArray: migrationColumn.isArray,
         isNullable: migrationColumn.isNullable,
-        isUnique: migrationColumn.isUnique,
+        /* For now unique constraints are created at a higher level
+        as we need to handle soft-delete and a bug on empty strings
+        */
+        // isUnique: migrationColumn.isUnique,
         asExpression: migrationColumn.asExpression,
         generatedType: migrationColumn.generatedType,
       }),