fix: Disable the Vite public directory to not interfere with a folder named 'public' (#17732) (#17743)

If you create a `src/main/resources/static/public` folder with static files, you will see a lot of
```
files in the public directory are served at the root path.
Instead of /public/images/logo.jpg, use /images/logo.jpg.
```
when trying to access the files. This is because the default "publcDir" of Vite is "public" and the Vite server is queried for resources before loading from the class loader

Co-authored-by: Artur <[email protected]>

Author: vaadin-bot

flow-server/src/main/resources/vite.generated.ts

@@ -665,6 +665,7 @@ export const vaadinConfig: UserConfigFn = (env) => {
   return {
     root: frontendFolder,
     base: '',
+    publicDir: false,
     resolve: {
       alias: {
         '@vaadin/flow-frontend': jarResourcesFolder,