Catch fetchDeployMetadata error and redirect to 404 (#5380)

## Problem solved

Short description of the bug fixed or feature added

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---

## PR-Codex overview
This PR enhances error handling in the `page.tsx` files for the `publish` and `deploy` routes. It introduces checks to call `notFound()` when metadata cannot be fetched, improving user experience by handling cases where the requested data is unavailable.

### Detailed summary
- In `apps/dashboard/src/app/(dashboard)/contracts/publish/[publish_uri]/page.tsx`:
  - Added a check for `publishMetadataFromUri` and called `notFound()` if it is not present.

- In `apps/dashboard/src/app/(dashboard)/contracts/deploy/[compiler_uri]/page.tsx`:
  - Added a check for `metadata` and called `notFound()` if it is not present.

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Author: MananTank

apps/dashboard/src/app/(dashboard)/contracts/deploy/[compiler_uri]/page.tsx

@@ -1,4 +1,5 @@
 import { getThirdwebClient } from "@/constants/thirdweb.server";
+import { notFound } from "next/navigation";
 import { fetchDeployMetadata } from "thirdweb/contract";
 import { DeployContractInfo } from "../../../published-contract/components/contract-info";
 import { DeployFormForUri } from "../../../published-contract/components/uri-based-deploy";
@@ -16,7 +17,12 @@ export default async function DirectDeployPage(props: DirectDeployPageProps) {
     client: getThirdwebClient(),
     // force `ipfs://` prefix
     uri: parsedUri.startsWith("ipfs://") ? parsedUri : `ipfs://${parsedUri}`,
-  });
+  }).catch(() => null);
+
+  if (!metadata) {
+    notFound();
+  }
+
   return (
     <div className="container flex flex-col gap-4 py-8">
       <DeployContractInfo

apps/dashboard/src/app/(dashboard)/contracts/publish/[publish_uri]/page.tsx

@@ -25,7 +25,11 @@ export default async function PublishContractPage(
   const publishMetadataFromUri = await fetchDeployMetadata({
     uri: publishUri,
     client: getThirdwebClient(),
-  });
+  }).catch(() => null);
+
+  if (!publishMetadataFromUri) {
+    notFound();
+  }
 
   let publishMetadata = publishMetadataFromUri;