feat: add Tempo chain as additionnal network (#29515)

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## **Description**

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Chain ID: `4217` / `0x1079`
Native symbol: None but setting as `USD`, consistently with what is done
everywhere in the Tempo ecosystem.
RPC: https://rpc.tempo.xyz
Explorer: https://explore.tempo.xyz/

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CHANGELOG entry: add Tempo chain to the additional networks list

## **Related issues**

Fixes:
https://consensyssoftware.atlassian.net/browse/NEB-1098?atlOrigin=eyJpIjoiNTExNzIwM2EwYjc5NDdkMmFiMTkwY2VmMzhmODllNzAiLCJwIjoiaiJ9

## **Manual testing steps**

Use the
[additional-networks-blacklist](https://app.launchdarkly.com/projects/metamask-client-config-api-extension/flags/additional-networks-blacklist)
flag to test `Tempo Off` variation, which will make Tempo Network
disappear as Additional Network by default.

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

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#### Performance checks (if applicable)

- [ ] I've tested on Android
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Small, additive change that only extends the static popular-network
configuration and its test; main risk is misconfigured RPC/explorer
metadata or missing image asset.
> 
> **Overview**
> Adds the `Tempo` network to `PopularList`, including chainId `0x1079`
(4217), RPC endpoint, block explorer URL, ticker (`USD`), warning flag,
and a bundled logo (`tempo.png`) so it appears in the additional network
selection.
> 
> Updates the popular network chainId unit test to assert the new
`Tempo` entry is present and correctly encoded.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
0a83f05. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: maxime-oe

app/util/networks/customNetworks.test.ts

@@ -22,6 +22,7 @@ describe('popularNetwork', () => {
       Monad: toHex('143'),
       HyperEVM: toHex('999'),
       MegaETH: toHex('4326'),
+      Tempo: toHex('4217'),
     };
 
     PopularList.forEach((rpc) => {

app/util/networks/customNetworks.tsx

@@ -190,6 +190,19 @@ export const PopularList = [
       imageSource: require('../../images/megaeth-mainnet-logo.png'),
     },
   },
+  {
+    chainId: toHex('4217'),
+    nickname: 'Tempo',
+    rpcUrl: `https://rpc.tempo.xyz/`,
+    failoverRpcUrls: [],
+    ticker: 'USD',
+    warning: true,
+    rpcPrefs: {
+      blockExplorerUrl: 'https://explore.tempo.xyz/',
+      imageUrl: 'TEMPO',
+      imageSource: require('../../images/tempo.png'),
+    },
+  },
 ];
 
 /**