Migrate away from @nodejs-github-bot tokens.

@nodejs-github-bot

I think we should stop creating PATs associated with @nodejs-github-bot, and instead rely on the more secure alternative: GitHub App Tokens.

I've created a basic GitHub app that can be transferred into the org to replace @nodejs-github-bot.

WDYT?

You probably need to include some details on why that would be a more secure alternative

Compared to PATs, GitHub App Tokens are:

A PAT is scoped to whoever generated it, so the bot's access is effectively riding on that person's account. If that robot's account is ever compromised, the bot's credentials are entangled with them. A GitHub App is its own identity, owned by the org, so it keeps working and stays cleanly auditable as "the bot" independent of any one specific account.
GitHub App installation tokens expire after about 8 hours by default. Our PATs are issued for a year each time. If a credential ever leaks, the App-based approach caps the exposure window dramatically compared to a PAT.
A GitHub App is only installed on the specific repos it needs, with fine-grained permissions for just the actions it performs (e.g., commenting, labeling), rather than broad scopes like repo.

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