Add Linea to price api supported chains (#3797)

## Explanation

Adds Linea to the list of chains the price API supports. To enable
pricing ERC20 tokens.

Before:

<img width="345" alt="Screenshot 2024-01-18 at 12 03 53 PM"
src="https://github.com/MetaMask/core/assets/3500406/95267449-607a-42d6-8ff4-19cb01b0a555">


After:

<img width="349" alt="Screenshot 2024-01-18 at 3 50 05 PM"
src="https://github.com/MetaMask/core/assets/3500406/0af6a27d-b179-4fec-b673-7b9e77ee8031">


## References

## Changelog

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### `@metamask/assets-controllers`

- **ADDED**: Add Linea to the price api supported chains

## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've highlighted breaking changes using the "BREAKING" category
above as appropriate

packages/assets-controllers/src/token-prices-service/codefi-v2.ts

@@ -233,6 +233,8 @@ export const SUPPORTED_CHAIN_IDS = [
   '0x4e454152',
   // Harmony Mainnet Shard 0
   '0x63564c40',
+  // Linea Mainnet
+  '0xe708',
 ] as const;
 
 /**