deps: remove dead js deps

The following deps are no longer used in the monorepo:

- lerna
- copyfiles
- mkdirp

This was confirmed using `git grep -rin` for the package
name in the monorepo. Deleting these from the root `package.json`
will reduce some noise in the monorepo by preventing dependabot
update PRs as well as reducing the dependency tree and install time.

package.json

@@ -47,7 +47,6 @@
     "@typescript-eslint/eslint-plugin": "^5.60.1",
     "@typescript-eslint/parser": "^5.60.1",
     "chai": "^4.2.0",
-    "copyfiles": "^2.3.0",
     "depcheck": "^1.4.3",
     "doctoc": "^2.2.0",
     "eslint": "^8.43.0",
@@ -62,11 +61,9 @@
     "eslint-plugin-react": "^7.24.0",
     "eslint-plugin-unicorn": "^42.0.0",
     "husky": "^8.0.3",
-    "lerna": "^7.1.5",
     "lint-staged": "14.0.1",
     "markdownlint": "^0.30.0",
     "markdownlint-cli2": "0.4.0",
-    "mkdirp": "^3.0.1",
     "mocha": "^10.2.0",
     "nx": "16.8.1",
     "nyc": "^15.1.0",