chore: Use string IDs instead of integer ones

packages/web/src/graphql/queries/get-flow.ts

@@ -1,7 +1,7 @@
 import { gql } from '@apollo/client';
 
 export const GET_FLOW = gql`
-  query GetFlow($id: Int!) {
+  query GetFlow($id: String!) {
     getFlow(id: $id) {
       id
       name

packages/web/src/graphql/queries/test-connection.ts

@@ -1,7 +1,7 @@
 import { gql } from '@apollo/client';
 
 export const TEST_CONNECTION = gql`
-  query TestConnection($id: Int!) {
+  query TestConnection($id: String!) {
     testConnection(id: $id) {
       id
       verified