Do not consider env/* labels as triaging labels

[gsmet]

When we triage an issue, if we didn't add any label, we add the needs-triage one.

The problem is that we should only consider area/* labels in this as env/* labels are not enough to properly triage something.

So we should change the behavior to add the needs-triage label if we didn't add any area/* labels.

See quarkusio/quarkus#17755 for an example of the wrong behavior.

The rule is the following: https://github.com/quarkusio/quarkus-github-bot/blob/main/src/main/java/io/quarkus/bot/TriageIssue.java