Improve stale workflow (#1867)

Author: amithm7

.github/workflows/stale.yaml

@@ -15,10 +15,18 @@ jobs:
           operations-per-run: 60
           days-before-issue-stale: 60
           days-before-issue-close: 30
-          stale-issue-label: "stale"
-          stale-issue-message: "This issue is stale because it has been open for 60 days with no activity."
-          close-issue-message: "This issue was closed because it has been inactive for 30 days since being marked as stale."
+          stale-issue-label: stale
+          stale-issue-message: |
+            This issue is stale because it has been open for 60 days with no activity.
+            It will be closed in 30 days on inactivity.
+          close-issue-message: |
+            This issue was closed because it has been inactive for 30 days since being marked as stale.
           days-before-pr-stale: -1
           days-before-pr-close: -1
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-          exempt-issue-labels: "in-progress,assigned,kind/enhancement"
+          exempt-all-assignees: true
+          exempt-issue-labels: >-
+            in-progress,
+            assigned,
+            kind/bug,
+            kind/enhancement