chore: bump assets controller to v43 and unlock multichain token detection and token list

[salimtb]

Description

This PR will upgrade the assets controller to version 43, enabling the multichain token auto-detection feature and adding new polling capabilities in the tokenListController. All multichain auto-detection changes are gated behind a feature flag.

Related issues

Fixes:

Manual testing steps

1. install dependencies using yarn
2. start the project using PORTFOLIO_VIEW=1 yarn start
3. add other networks where you have tokens
4. the autodetection should be multichain

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• 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 format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). 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.

[github-actions]

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[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher

🚮 Removed packages: npm/@metamask/[email protected]

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[salimtb]

@metamaskbot update-policies

[metamaskbot]

Policies updated.
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