refactor(@angular-devkit/build-angular): avoid for await...of with promise arrays

The upcoming version of typescript Eslint rules will fail the `await-thenable`
rule for cases of for await...of that use promise arrays. This change
removes the usage to avoid lint failures during the version update.
Ref: https://typescript-eslint.io/rules/await-thenable/#async-iteration-for-awaitof-loops

Author: clydin

packages/angular_devkit/build_angular/src/utils/tailwind.ts

@@ -28,7 +28,7 @@ export async function findTailwindConfigurationFile(
   );
 
   // A configuration file can exist in the project or workspace root
-  for await (const { root, files } of dirEntries) {
+  for (const { root, files } of await Promise.all(dirEntries)) {
     for (const potentialConfig of tailwindConfigFiles) {
       if (files.has(potentialConfig)) {
         return join(root, potentialConfig);