Revive issue auto closer

[ashie]

Which issue(s) this PR fixes:
N/A

What this PR does / why we need it:
Although issue auto closer is disabled at d005002 without discussion, I think we still need it at least for waiting-for-users and stable labels.

We need to revive it and tune which issues should be closed automatically.

Docs Changes:
None.

Release Note:
None.

[ashie]

As I described in 5846a07 I think roots/issue-closer-action isn't needed in any way.

[ashie]

Untriaged issues should be closed automatically.
We should tune it in this PR.

[daipom]

I basically agree.

I have a question about automatically staling or closing items that are not labeled at all, but I think it is a good idea to automatically stale and close items that are labeled with waiting-for-users, for example.

Even if we don't decide in detail now, we can tune these things later.

[ashie]

I introduced waiting-for-triage to fluent-plugin-kafka repository for this purpose:
fluent/fluent-plugin-kafka@85538f6

[daipom]

In fluent-plugin-remote_syslog, automatically staling and closing issues with answered label as follows.

https://github.com/fluent-plugins-nursery/fluent-plugin-remote_syslog/blob/master/.github/workflows/close-answered-issues.yml

[daipom]

I introduced waiting-for-triage to fluent-plugin-kafka repository for this purpose: fluent/fluent-plugin-kafka@85538f6

Oh, automatically adding waiting-for-triage at opening a new issue, I see! This looks nice idea!

[ashie]

I've added same settings for fluent-plugin-kafka, and shorten days-before-stale to 30 because 90 is too long for answered issues.

[daipom]

LGTM. I agree.