fix: (temporarily) disable template ast reuse

For the same reason as vitejs/vite-plugin-vue@5d68fbd

TODO:
Re-enable this optimization with the newly added option in vuejs/core@6fab855

src/templateLoader.ts

@@ -44,10 +44,10 @@ const TemplateLoader: LoaderDefinitionFunction = function (source, inMap: any) {
 
   const compiled = compileTemplate({
     source,
-    ast:
-      descriptor.template && !descriptor.template.lang
-        ? descriptor.template.ast
-        : undefined,
+    // ast:
+    //   descriptor.template && !descriptor.template.lang
+    //     ? descriptor.template.ast
+    //     : undefined,
     filename: loaderContext.resourcePath,
     inMap,
     id: scopeId,