Switch to new secret name for teams webhook (#4757)

Fix notification delivery for sanity test failures

---

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [x] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Test Plan

- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

.github/workflows/sanity-test.yaml

@@ -440,4 +440,4 @@ jobs:
         uses: ./.github/actions/teams-message
         with:
           msg: "[FAILED] Sanity Tests"
-          teams_url: ${{ secrets.SLACK_WEBHOOK_URL }}
+          teams_url: ${{ secrets.TEAMS_WEBHOOK_URL }}