Skip webpack test in Turbopack test run (#57195)

This test checks webpack loaders so can be safely disabled for Turbopack.

test/e2e/app-dir/rsc-basic/rsc-basic.test.ts

@@ -557,15 +557,19 @@ createNextDescribe(
       ).toBe('count: 1')
     })
 
-    it('should support webpack loader rules', async () => {
-      const browser = await next.browser('/loader-rule')
-
-      expect(
-        await browser.eval(
-          `window.getComputedStyle(document.querySelector('#red')).color`
-        )
-      ).toBe('rgb(255, 0, 0)')
-    })
+    // Skip as Turbopack doesn't support webpack loaders.
+    ;(process.env.TURBOPACK ? it.skip : it)(
+      'should support webpack loader rules',
+      async () => {
+        const browser = await next.browser('/loader-rule')
+
+        expect(
+          await browser.eval(
+            `window.getComputedStyle(document.querySelector('#red')).color`
+          )
+        ).toBe('rgb(255, 0, 0)')
+      }
+    )
 
     if (isNextStart) {
       it('should generate edge SSR manifests for Node.js', async () => {