Remove issues staleness (#7569)

Close only stale PRs.

.github/workflows/close-stale-issues.yaml → .github/workflows/close-stale-prs.yaml

@@ -1,4 +1,4 @@
-name: Close stale issues and PRs
+name: Close stale PRs
 
 on:
   schedule:
@@ -14,14 +14,9 @@ jobs:
       with:
         stale-pr-message: 'This PR is now marked as stale after 30 days of inactivity, and will be closed soon. To keep it, mark it with the "no stale" label.'
         close-pr-message: 'Closing this PR because it has been stale for 7 days with no activity.'
-        stale-issue-message: 'This issue is now marked as stale after 90 days of inactivity, and will be closed soon. To keep it, mark it with the "no stale" label.'
-        close-issue-message: 'Closing this issue because it has been stale for 7 days with no activity.'
-        days-before-issue-stale: 90
         days-before-pr-stale: 30
         days-before-close: 7
         stale-pr-label: stale
-        stale-issue-label: stale
         exempt-pr-labels: 'no stale'
-        exempt-issue-labels: 'no stale'
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         operations-per-run: 300