Improve how we handle active "good first issue" issues

Problem

I’m concerned that good first issue (https://github.com/nodejs/node/labels/good%20first%20issue) issues get spammed so heavily that we may become less likely to use the label at all. Which I think is already happening.

That would be a bad outcome, because it could quietly raise the barrier for new contributors. A genuine contributor may see several open PRs and a long comment thread, assume the issue is already taken, and move on.

One example is https://github.com/nodejs/node/issues/60884, where people continue opening PRs or asking to work on it despite several PRs already being open.

To be clear, the goal is not to prevent multiple PRs. It is to keep good first issue useful as an entry point for genuine new contributors.

Potential improvements

I checked how some other large repositories handle this and found a few approaches worth considering. I'd be happy to hear other approaches though.

1. Use a different label

Some repositories use less well-known labels instead of good first issue, such as Rust’s [E-easy](https://github.com/rust-lang/rust/issues?q=sort%3Aupdated-desc%20is%3Aissue%20state%3Aopen%20label%3AE-easy).

Since good first issue is heavily targeted by bots and automated searches, using a different label could reduce some of that noise.

2. Remove the label once there is an active PR

Godot does this: the good first issue label is removed while there is an active PR that appears to solve the issue.

We could start by doing this manually and potentially automate it later based on linked PR status.

3. Add a claim system

Rust uses [@rustbot claim](https://github.com/rust-lang/rust-clippy/blob/master/CONTRIBUTING.md) to let contributors claim issues.

I like this option less because of the risk of people claiming issues and disappearing, but claims could expire after a few days unless there is an open PR or visible progress.

現在の good first issue ラベルと issue #60884 の例を確認し、提案されているアプローチを比較する: 別のラベル、アクティブな PR が存在する場合にラベルを削除する方法、またはクレームシステム。関連するワークフローの詳細について、リンクされている Godot と Rust のガイダンスを確認する。Node.js に対して合意されたアプローチを選択して文書化すれば完了とする。まだアプローチは選択されていない。