Adding alert prop with external id info

Author: GTFalcao

components/salesforce_rest_api/actions/upsert-record/upsert-record.mjs

@@ -64,6 +64,11 @@ export default {
         description: "The field to use as the external ID to identify the record.",
         options: externalIdFieldOptions,
       },
+      docsInfoExtId: {
+        type: "alert",
+        alertType: "info",
+        content: "If you don't see any fields in the above list, you probably need to create one in Salesforce's Object Manager. Only a field marked as an external id field can be used to identify a record."
+      },
       externalIdValue: {
         type: "string",
         label: "External ID Value",
@@ -87,6 +92,7 @@ export default {
       getAdditionalFields: getData,
       convertFieldsToProps,
       docsInfo,
+      docsInfoExtId,
       additionalFields,
       externalIdFieldName,
       externalIdValue,