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The `AccountsApiBalanceFetcher` had a bug caused by address format
incompatibility between controllers:
- `TokenBalancesController` uses lowercase addresses for ERC20 tokens
- `AccountTrackerController` uses checksum addresses for native tokens

The original code always checksummed all addresses, causing a wrong
token balances state

core PR: MetaMask/core#6812

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CHANGELOG entry: fix balances issue update when api fetcher is used

Fixes: #21030

```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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- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
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- [ ] I've completed the PR template to the best of my ability
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guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
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app, test code being changed).
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in the ticket it closes and includes the necessary testing evidence such
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adjusts `AccountsApiBalanceFetcher` to use the correct account address
format per token type and applies Yarn patches for
`@metamask/assets-controllers` v78/v79.
>
> - **Services**:
>   - `dist/multi-chain-accounts-service/api-balance-fetcher.cjs`:
> - Introduces `finalAccount` based on token type (zero address vs.
others).
> - Uses `finalAccount` for `nativeBalancesFromAPI` keys and returned
`account` field.
> - **Build/Tooling**:
> - Adds Yarn patches for `@metamask/assets-controllers` `^78.0.1` and
`^79.0.0` in `package.json` and `.yarn/patches/`.
> - Updates `yarn.lock` to reference patched
`@metamask/assets-controllers` 79.0.0.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3968057. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->