chore: improve maintenance

[balazsorban44]

I cleaned up the following:

• stale action: Does not link to Regarding stale issues #912 anymore. If we want to make that info more prominent, maybe the CONTRIBUTING.md file is more prominent, we should link to that instead. This PR does not address that.
• PR labeler action: Cleaned it up and locked the version on the action to prevent future issues
• Issue labeler action: New bot that auto triages adapter bug reports. based on the dropdown choice of the user, it will add the adapter specific issue label
• Bug report issue template: This is our default template, should mostly be used for core-specific reports and later on (Make next-auth framework agnostic (Vite, Vue, Express...) #2294) other frameworks.
• Bug report (Adapter): Since moving to a monorepo (Move all NextAuth.js projects into a monorepo #3952), we will need to manage adapters better. This new template asks adapter questions like a version of that adapter and provides a dropdown for the user of our available adapters (and another category for custom adapters). Used by the Issue labeler action to auto-label these with the specific adapter type to be able to scan the issues more easily.
• Bug report (Provider): Similar to the above one, but we don't auto-label these individually since all of them are in the core.
• default label for bug reports/feature requests is now "triage". A maintainer will need to mark something as a "bug" or "accepted" before it is considered for further investigation.
• issues with the label "triage" won't be auto-closed
• issues with the label "accepted" won't be auto-closed

Check the labels page for the new and existing labels: https://github.com/nextauthjs/next-auth/labels

What we could do in addition is to create PR templates specific for new providers and adapters with precise checkpoints (testing, expectations, docs, etc). This can be addressed in a subsequent PR.

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[ndom91]

This looks awesome! Great job cleaning all this up. Love the little details like the links to the docs for the various labelers, etc.

[balazsorban44]

cc @lluia, @StefanSelfTaught, @ThangHuuVu. This hopefully will help with triaging.