chore(meta): disable stale bot on issues

.github/stale.yml

@@ -23,15 +23,3 @@ pulls:
     activity occurs, but it only takes a comment to keep a contribution alive
     :) Also, even if it is closed, you can always reopen the PR when you're
     ready. Thank you for contributing.
-
-issues:
-  daysUntilStale: 90
-  daysUntilClose: 7
-  exemptLabels:
-    - valid
-    - to-validate
-    - QA
-  markComment: >
-    This issue has been automatically marked as inactive because it has not had
-    recent activity and it wasn't validated by maintainer team. It will be
-    closed within a week if no further activity occurs.