fix: remove usePopularNetworks hook and replace with const (MetaMask#23525)

## **Description**

PR to remove the usePopularNetworks hook in favor of constant list for
trending.

## **Changelog**

CHANGELOG entry: Removes usePopularNetworks hook and replace it with
constant.

## **Related issues**

Fixes:
https://consensyssoftware.atlassian.net/jira/software/c/projects/ASSETS/boards/1567?assignee=61a5edc8b0b630006a140ec1&selectedIssue=ASSETS-1916

## **Manual testing steps**

```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]
```

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**

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## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Replaces the dynamic popular networks hook with a static
TRENDING_NETWORKS_LIST used across trending UI and hooks, removes the
hook/tests, and adds SEI to network constants.
> 
> - **Trending networks source**:
> - Introduce static `TRENDING_NETWORKS_LIST` in
`app/components/UI/Trending/utils/trendingNetworksList.ts` with
predefined `ProcessedNetwork` entries (incl. Solana/Tron guards).
> - Add `SEI` to `NetworkToCaipChainId`
(`app/components/UI/NetworkMultiSelector/NetworkMultiSelector.constants.ts`).
> - **Hook and component updates**:
>   - Replace `usePopularNetworks` with `TRENDING_NETWORKS_LIST` in:
>     - `useTrendingRequest.ts`
>     - `useSearchRequest.ts`
>     - `TrendingTokenNetworkBottomSheet.tsx`
> - **Removals**:
>   - Delete `usePopularNetworks` hook and its tests.
> - **Tests**:
>   - Update tests to mock `TRENDING_NETWORKS_LIST` and expectations in:
>     - `TrendingTokenNetworkBottomSheet.test.tsx`
>     - `TrendingTokenRowItem.test.tsx`
>     - `useTrendingRequest.test.ts`
>     - `useSearchRequest.test.ts`
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
02a7160. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: sahar-fehri

app/components/UI/NetworkMultiSelector/NetworkMultiSelector.constants.ts

@@ -38,4 +38,5 @@ export enum NetworkToCaipChainId {
   LOCALHOST = 'eip155:1337',
   ETHEREUM_SEPOLIA = 'eip155:11155111',
   LINEA_SEPOLIA = 'eip155:59141',
+  SEI = 'eip155:1329',
 }

app/components/UI/Trending/components/TrendingTokenRowItem/TrendingTokenRowItem.test.tsx

@@ -4,6 +4,11 @@ import renderWithProvider from '../../../../../util/test/renderWithProvider';
 import TrendingTokenRowItem from './TrendingTokenRowItem';
 import type { TrendingAsset } from '@metamask/assets-controllers';
 
+// Mock the trendingNetworksList module to avoid getNetworkImageSource errors
+jest.mock('../../utils/trendingNetworksList', () => ({
+  TRENDING_NETWORKS_LIST: [],
+}));
+
 const mockNavigate = jest.fn();
 
 jest.mock('@react-navigation/native', () => ({

app/components/UI/Trending/components/TrendingTokensBottomSheet/TrendingTokenNetworkBottomSheet.test.tsx

@@ -15,32 +15,33 @@ jest.mock('../../../../../util/networks', () => ({
     mockGetNetworkImageSource(params),
 }));
 
-const mockNetworks: ProcessedNetwork[] = [
-  {
-    id: 'eip155:1',
-    name: 'Ethereum Mainnet',
-    caipChainId: 'eip155:1' as CaipChainId,
-    imageSource: {
-      uri: 'https://example.com/ethereum.png',
-    } as ImageSourcePropType,
-    isSelected: false,
-  },
-  {
-    id: 'eip155:137',
-    name: 'Polygon',
-    caipChainId: 'eip155:137' as CaipChainId,
-    imageSource: {
-      uri: 'https://example.com/polygon.png',
-    } as ImageSourcePropType,
-    isSelected: false,
-  },
-];
-
-const mockUsePopularNetworks = jest.fn(() => mockNetworks);
+// Mock the TRENDING_NETWORKS_LIST constant
+jest.mock('../../utils/trendingNetworksList', () => {
+  const mockNetworks: ProcessedNetwork[] = [
+    {
+      id: 'eip155:1',
+      name: 'Ethereum Mainnet',
+      caipChainId: 'eip155:1' as CaipChainId,
+      imageSource: {
+        uri: 'https://example.com/ethereum.png',
+      } as ImageSourcePropType,
+      isSelected: false,
+    },
+    {
+      id: 'eip155:137',
+      name: 'Polygon',
+      caipChainId: 'eip155:137' as CaipChainId,
+      imageSource: {
+        uri: 'https://example.com/polygon.png',
+      } as ImageSourcePropType,
+      isSelected: false,
+    },
+  ];
 
-jest.mock('../../hooks/usePopularNetworks/usePopularNetworks', () => ({
-  usePopularNetworks: () => mockUsePopularNetworks(),
-}));
+  return {
+    TRENDING_NETWORKS_LIST: mockNetworks,
+  };
+});
 
 let storedOnClose: (() => void) | undefined;
 
@@ -209,7 +210,6 @@ describe('TrendingTokenNetworkBottomSheet', () => {
     storedOnClose = undefined;
     mockOnClose.mockClear();
     mockOnOpenBottomSheet.mockClear();
-    mockUsePopularNetworks.mockReturnValue(mockNetworks);
     mockGetNetworkImageSource.mockImplementation(
       (params: { chainId: string }) => {
         if (params.chainId === 'eip155:1') {

app/components/UI/Trending/components/TrendingTokensBottomSheet/TrendingTokenNetworkBottomSheet.tsx

@@ -19,7 +19,7 @@ import Avatar, {
 import { strings } from '../../../../../../locales/i18n';
 import { ProcessedNetwork } from '../../../../hooks/useNetworksByNamespace/useNetworksByNamespace';
 import { CaipChainId } from '@metamask/utils';
-import { usePopularNetworks } from '../../hooks/usePopularNetworks/usePopularNetworks';
+import { TRENDING_NETWORKS_LIST } from '../../utils/trendingNetworksList';
 
 export enum NetworkOption {
   AllNetworks = 'all',
@@ -51,7 +51,7 @@ const TrendingTokenNetworkBottomSheet: React.FC<
 }) => {
   const sheetRef = useRef<BottomSheetRef>(null);
   const { colors } = useTheme();
-  const networks = usePopularNetworks();
+  const networks = TRENDING_NETWORKS_LIST;
 
   // Default to "All networks" if no selection
   const [selectedNetwork, setSelectedNetwork] = useState<