chore: remove unused code (page-hot-reloader) (#28940)

* chore: remove unused code

* don't use removed file in tests

Author: pieh

packages/gatsby/src/bootstrap/page-hot-reloader.ts

@@ -186,9 +186,10 @@ const setup = async ({ restart = isFirstRun, clearCache = false } = {}) => {
 
   if (restart) {
     await require(`../../schema`).build({})
-    await apiRunner(`createPages`)
   }
 
+  await apiRunner(`createPages`)
+
   Object.entries(pageQueries).forEach(([componentPath, query]) => {
     store.dispatch({
       type: `QUERY_EXTRACTED`,
@@ -227,10 +228,6 @@ const setup = async ({ restart = isFirstRun, clearCache = false } = {}) => {
 
   await saveState()
 
-  if (restart) {
-    require(`../../bootstrap/page-hot-reloader`)
-  }
-
   const idsOfQueriesThatRan = queryRunner.mock.calls.map(call => call[1].id)
 
   const pathsOfPagesWithQueriesThatRan = idsOfQueriesThatRan