chore: bump dependents to @metamask/utils@^12.0.0

[cryptodev-2s]

Explanation

Follow up to #10185, which moved @metamask/utils into packages/. This bumps its dependents to the local version.

• @metamask/utils bumped from ^11.12.0 to ^12.0.0 in 79 packages and the root
• Removes the temporary @metamask/utils entry from ALLOWED_INCONSISTENT_DEPENDENCIES in yarn.config.cjs, which chore: integrate @metamask/utils into packages/ #10185 added so that constraints would pass while the dependents were still on the published version
• Changelog entries recorded for the bump, plus the lockfile dedupe and README dependency graph that follow from it

These two PRs are meant to land together, so the intermediate state where dependents still resolve the published copy never reaches main.

Splitting it this way keeps #10185 reviewable: the move, the config rewiring and the type test change are separate from 79 mechanical version bumps.

References

• Follows chore: integrate @metamask/utils into packages/ #10185

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

Medium Risk
A major-version bump of a shared utility touches most packages; runtime risk is low if v12 is compatible, but consumers and lingering v11 transitive deps (keyring) can cause type or duplicate-package issues until fully aligned.

Overview
This PR aligns the monorepo with the in-repo @metamask/utils v12 after it was moved into packages/ (follow-up to #10185). 79 packages plus the root bump the dependency from ^11.12.0 to ^12.0.0, with matching Unreleased changelog entries and an updated README dependency graph.

Tooling is cleaned up so builds use the workspace package instead of the published copy: tsconfig.packages.json now maps @metamask/utils to local source (the temporary node_modules override is removed), and yarn.config.cjs drops the ALLOWED_INCONSISTENT_DEPENDENCIES exception for @metamask/utils.

There are small TypeScript follow-ups from the version split: network-controller removes a stale @ts-expect-error on Infura middleware now that types match v12, while keyring-controller adds a documented @ts-expect-error when casting legacy keyrings until @metamask/keyring-utils also depends on v12.

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[mcmire]

LGTM.