Enable the unicorn/throw-new-error linting rule

For more information refer to
https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/throw-new-error.md.

This didn't require any changes because we already do this correctly,
but it ensures that new code remains consistent and explicit.

.eslintrc

@@ -79,6 +79,7 @@
     "unicorn/prefer-string-replace-all": "error",
     "unicorn/prefer-string-starts-ends-with": "error",
     "unicorn/prefer-ternary": ["error", "only-single-line"],
+    "unicorn/throw-new-error": "error",
 
     // Possible errors
     "for-direction": "error",