[FIX] Make a better use of stale action operations

Before this patch, as you can see in [the logs attached here][1], the bot ran 3 times.

The last one is untouched, but the other two are now merged into a single execution. This way we do less API calls and get it running faster. Also the logs will become less confusing.

[1]: OCA/web#2037 (review)

.github/workflows/stale.yml

@@ -8,18 +8,18 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      # 120+30 day stale policy for PRs
-      # * Except PRs marked as "no stale"
-      - name: Stale PRs policy
+      - name: Stale PRs and issues policy
         uses: actions/stale@v4
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-          exempt-pr-labels: "no stale"
-          days-before-stale: 120
-          days-before-close: 30
-          days-before-issue-stale: -1
-          days-before-issue-close: -1
+          # General settings.
           remove-stale-when-updated: true
+          # Pull Requests settings.
+          # 120+30 day stale policy for PRs
+          # * Except PRs marked as "no stale"
+          days-before-pr-stale: 120
+          days-before-pr-close: 30
+          exempt-pr-labels: "no stale"
           stale-pr-label: "stale"
           stale-pr-message: >
             There hasn't been any activity on this pull request in the past 4 months, so
@@ -28,19 +28,12 @@ jobs:
 
             If you want this PR to never become stale, please ask a PSC member to apply
             the "no stale" label.
-
-      # 180+30 day stale policy for open issues
-      # * Except Issues marked as "no stale"
-      - name: Stale Issues policy
-        uses: actions/stale@v4
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          # Issues settings.
+          # 180+30 day stale policy for open issues
+          # * Except Issues marked as "no stale"
+          days-before-issue-stale: 180
+          days-before-issue-close: 30
           exempt-issue-labels: "no stale,needs more information"
-          days-before-stale: 180
-          days-before-close: 30
-          days-before-pr-stale: -1
-          days-before-pr-close: -1
-          remove-stale-when-updated: true
           stale-issue-label: "stale"
           stale-issue-message: >
             There hasn't been any activity on this issue in the past 6 months, so it has