[Global] Chore: Automate stale issues and PRs (30 days to stale, then 5 days till closing) (#5262)

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## PR-Codex overview
This PR adds a GitHub Actions workflow to automatically close stale issues and pull requests after a specified period of inactivity.

### Detailed summary
- Introduced a new workflow in `.github/workflows/stale.yml` named 'Close stale issues and PRs'.
- Configured the workflow to trigger on a schedule using a cron job.
- Set the job to run on `ubuntu-latest`.
- Utilized `actions/stale@v9` for managing stale issues and PRs.
- Configured messages for stale issues and PRs.
- Defined `days-before-stale` as 30 and `days-before-close` as 5.

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Author: gregfromstl

.github/workflows/stale.yml

@@ -0,0 +1,15 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue has been inactive for 30 days. It is now marked as stale and will be closed in 5 days if no further activity occurs.'
+          stale-pr-message: 'This PR has been inactive for 30 days. It is now marked as stale and will be closed in 5 days if no further activity occurs.'
+          days-before-stale: 30
+          days-before-close: 5