Remove breaking designation from version bumps in changelog

[jeffsmale90]

Explanation

In #7330 we added the BREAKING designation to version bumps. This change removes those to avoid confusion.

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

---

Note

Removes BREAKING labels from specific dependency bump entries in the shield-controller and signature-controller changelogs.

• Changelogs:
  • packages/shield-controller/CHANGELOG.md:
    • Remove BREAKING designation from bump of @metamask/signature-controller ^37.0.0 → ^38.0.0 in 4.0.0.
  • packages/signature-controller/CHANGELOG.md:
    • Remove BREAKING designation from bump of @metamask/gator-permissions-controller ^0.6.0 → ^0.8.0 in 38.0.0.

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[Gudahtt]

LGTM!