Remove text/x-turbo check from client side for use with SSG scenarios (#9162)

Author: brophdawg11

integration/error-boundary-v2-test.ts

@@ -409,7 +409,12 @@ test.describe("single fetch", () => {
         let app = new PlaywrightFixture(appFixture, page);
         await app.goto("/parent");
         await app.clickLink("/parent/child-with-boundary");
-        await waitForAndAssert(page, app, "#child-error", "CDN Error!");
+        await waitForAndAssert(
+          page,
+          app,
+          "#child-error",
+          "Unable to decode turbo-stream response from URL"
+        );
       });
     });