fix: styledComponents schema (#69230)

## Why?

Both the `topLevelImportPaths` and `meaninglessFilenames` should not
need a minimal of 1 item in their arrays.

- Fixes https://github.com/vercel/next.js/issues/68573

packages/next/src/server/config-schema.ts

@@ -200,10 +200,10 @@ export const configSchema: zod.ZodType<NextConfig> = z.lazy(() =>
           z.boolean().optional(),
           z.object({
             displayName: z.boolean().optional(),
-            topLevelImportPaths: z.array(z.string()).min(1).optional(),
+            topLevelImportPaths: z.array(z.string()).optional(),
             ssr: z.boolean().optional(),
             fileName: z.boolean().optional(),
-            meaninglessFileNames: z.array(z.string()).min(1).optional(),
+            meaninglessFileNames: z.array(z.string()).optional(),
             minify: z.boolean().optional(),
             transpileTemplateLiterals: z.boolean().optional(),
             namespace: z.string().min(1).optional(),

test/integration/config-validation/test/index.test.ts

@@ -39,6 +39,17 @@ describe('next.config.js validation', () => {
             `Unrecognized key(s) in object: 'anotherNonExistent' at "experimental"`,
           ],
         },
+        {
+          name: 'invalid config array lengths',
+          configContent: `
+        module.exports = {
+          pageExtensions: []
+        }
+      `,
+          outputs: [
+            'Array must contain at least 1 element(s) at "pageExtensions"',
+          ],
+        },
       ])(
         'it should validate correctly for $name',
         async ({ outputs, configContent }) => {