stalebot: disable auto-closing of issues and pull requests

[sumnerevans]

Description

Makes the stalebot less aggressive by disabling its auto-close functionality.

Closes #2799

Example rendered messages:

• Issues: https://github.com/sumnerevans/home-manager/issues/1#issuecomment-1071914675
• PRs: https://github.com/sumnerevans/home-manager/issues/1#issuecomment-1071915401

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

[sumnerevans]

@lilyball FYI

[berbiche]

I propose removing the phrase "if you have nothing of substance to add" as it seems rather aggressive to me.

[sumnerevans]

Hmm... wondering how else to tell people not to comment "I have this issue too" as that really is not useful and just clutters the inbox of anyone who is watching the repo.

[berbiche]

"I have this issue too"

I don't think we've had much comments like these on HM issues, even before the introduction of the stale bot, though I agree with you that these comments only add noise.
Would this phrase be better "Please be considerate of people watching this issue and receiving notifications before commenting 'I have this issue too'. We welcome (additional information | contributions) that will help resolve this issue"?

[sumnerevans]

Changed the wording a bit, going to go ahead and merge this. We can adjust later if necessary.