[next]: Fix RSC rewrite behavior (#10415)

- Removes some of the hacks from #10388 that were attempting to resolve an issue with RSC prefetches to `pages` routes in favor of adding rsc rewrites for all dynamic paths, and letting it fall through to a 404 if there's no match
- Fixes an issue where RSC requests were matching the wrong path (filesystem rather than RSC variant) introduced in above mentioned change
  - Closes https://github.com/vercel/next.js/issues/54698

test/lib/deployment/test-deployment.js

@@ -220,6 +220,16 @@ async function runProbe(probe, deploymentId, deploymentUrl, ctx) {
     hadTest = true;
   }
 
+  if (probe.bodyMustBe) {
+    if (text !== probe.bodyMustBe) {
+      throw new Error(
+        `Fetched page ${probeUrl} does not have an exact body match of ${probe.bodyMustBe}. Content: ${text}`
+      );
+    }
+
+    hadTest = true;
+  }
+
   /**
    * @type Record<string, string[]>
    */