fix: replace id with _id for text and vision mfb prompts (#8530)

replace id with _id for text and vision mfb prompts

Author: scottheng96

src/app/modules/form/admin-form/admin-form.assistance.service.ts

@@ -311,7 +311,7 @@ export const createFormFieldsUsingTextPrompt = ({
 > => {
   return generateAndsendTextPromptToModel({
     userPrompt,
-    formId: form.id,
+    formId: form._id,
   })
     .andThen((modelResponse) => {
       if (!modelResponse) {
@@ -496,7 +496,7 @@ export const createFormFieldsUsingVisionPrompt = ({
   | FieldNotFoundError
 > => {
   return generateAndSendVisionPromptToModel({
-    formId: form.id,
+    formId: form._id,
     imageDataUrls,
   })
     .andThen((modelResponse) => {