chore: remove vestigial lint scripts from migrated packages

[cryptodev-2s]

Explanation

json-rpc-engine, eth-json-rpc-provider, eth-block-tracker and eth-json-rpc-middleware were imported into the monorepo from their own standalone repos (see docs/processes/package-migration-process-guide.md). Each kept the per-package lint scripts the standalone repo had:

"lint": "yarn lint:eslint && yarn lint:misc --check && yarn lint:dependencies",
"lint:dependencies": "depcheck",
"lint:eslint": "eslint .  --ext js,ts",
"lint:fix": "yarn lint:eslint --fix && yarn lint:misc --write && yarn lint:dependencies",
"lint:misc": "prettier '**/*.json' '**/*.md' '!CHANGELOG.md' '**/*.yml' '!.yarnrc.yml' --ignore-path .gitignore --no-error-on-unmatched-pattern",

None of the 80+ packages born in the monorepo have these scripts, and the scripts/create-package/package-template doesn't include them either — the root-level lint:eslint, lint:misc, lint:dependencies, etc. already cover all packages. The bins these scripts call (eslint, prettier, depcheck) are root-only devDependencies, and Yarn 4 does not expose those to a workspace script context (yarn workspace <pkg> run lint:eslint fails with command not found: eslint), so these scripts have been dead code since migration.

This PR removes all five scripts from the four affected packages so they match the rest of the monorepo. No CI workflow or root script references them.

References

N/A

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
Package.json script cleanup only; no runtime, API, or CI lint behavior changes.

Overview
Removes vestigial per-package lint scripts (lint, lint:eslint, lint:fix, lint:misc, lint:dependencies) from four packages that were migrated from standalone repos: @metamask/eth-block-tracker, @metamask/eth-json-rpc-middleware, @metamask/eth-json-rpc-provider, and @metamask/json-rpc-engine.

Their package.json scripts sections now match native monorepo packages (build, test, changelog only). Linting is unchanged in practice—root lint / lint:eslint / lint:misc / lint:dependencies already cover the whole repo; the removed workspace scripts were non-functional under Yarn 4 because tooling bins live at the root.

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