fix: fix assets controllers changelog

[sahar-fehri]

Explanation

PR to fix assets controller changelog.

I had this PR that introduced a breaking change: https://github.com/MetaMask/core/pull/7923/changes#diff-ee47d03d53776b8dd530799a8047f5e32e36e35765620aeb50b294adc3339fab

Somehow when my PR got merged in this commit 30f0614
The commit shows my breaking changed under [99.4.0] that was released here: https://github.com/MetaMask/core/pull/7944/changes#diff-ee47d03d53776b8dd530799a8047f5e32e36e35765620aeb50b294adc3339fab

References

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 communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Documentation-only change that reorders changelog entries; no behavioral, API, or dependency changes are introduced in code.

Overview
Moves the Blockaid token security scanning entry (including the BREAKING MultichainAssetsControllerMessenger action requirement) and the @metamask/phishing-controller / @metamask/network-enablement-controller bump notes into the Unreleased section of packages/assets-controllers/CHANGELOG.md, correcting their previous placement under 99.4.0. No runtime code changes.

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