chore(ci): send alert message when stencil-nightly workflow finishes (#30743)

Send alert to a Discord channel using a webhook.

---------

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## What is the current behavior?
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## What is the new behavior?
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this PR. -->

- If a step in the workflow fails, an alert message will be sent to a
Discord channel using a webhook.

## Does this introduce a breaking change?

- [ ] Yes
- [X] No

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  2. Update the BREAKING.md file with the breaking change.
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## Other information

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---------

Co-authored-by: Brandy Smith <brandyscarney@users.noreply.github.com>

.github/workflows/stencil-nightly.yml

@@ -225,3 +225,35 @@ jobs:
       - name: Check build matrix status
         if: ${{ needs.test-react-e2e.result != 'success' }}
         run: exit 1
+
+  send-success-messages:
+    needs: [test-core-clean-build, test-core-lint, test-core-spec, verify-screenshots, verify-test-vue-e2e, verify-test-angular-e2e, verify-test-react-router-e2e, verify-test-react-e2e]
+    runs-on: ubuntu-latest
+    if: ${{ !cancelled() && contains(needs.*.result, 'success') }}
+    steps:
+      - name: Notify success on Discord
+        run: |
+          curl -H "Content-Type:application/json" \
+          -d '{"embeds": [{"title": "✅ Workflow ${{github.workflow}} #${{github.run_number}} finished successfully", "color": 65280, "url": "${{github.server_url}}/${{github.repository}}/actions/runs/${{github.run_id}}"}]}' \
+          ${{secrets.DISCORD_NOTIFY_WEBHOOK}}
+      - name: Notify success on Slack
+        run: |
+          curl -H "Content-Type:application/json" \
+          -d '{"title": "✅ Workflow ${{github.workflow}} #${{github.run_number}} finished successfully", "url": "${{github.server_url}}/${{github.repository}}/actions/runs/${{github.run_id}}"}' \
+          ${{secrets.SLACK_NOTIFY_SUCCESS_WEBHOOK}}
+
+  send-failure-messages:
+    needs: [test-core-clean-build, test-core-lint, test-core-spec, verify-screenshots, verify-test-vue-e2e, verify-test-angular-e2e, verify-test-react-router-e2e, verify-test-react-e2e]
+    runs-on: ubuntu-latest
+    if: ${{ !cancelled() && contains(needs.*.result, 'failure') }}
+    steps:
+      - name: Notify failure on Discord
+        run: |
+          curl -H "Content-Type:application/json" \
+          -d '{"content": "Alerting <@&1347593178580254761>!", "embeds": [{"title": "❌ Workflow ${{github.workflow}} #${{github.run_number}} failed", "color": 16711680, "url": "${{github.server_url}}/${{github.repository}}/actions/runs/${{github.run_id}}"}]}' \
+          ${{secrets.DISCORD_NOTIFY_WEBHOOK}}
+      - name: Notify failure on Slack
+        run: |
+          curl -H "Content-Type:application/json" \
+          -d '{"title": "❌ Workflow ${{github.workflow}} #${{github.run_number}} failed", "url": "${{github.server_url}}/${{github.repository}}/actions/runs/${{github.run_id}}"}' \
+          ${{secrets.SLACK_NOTIFY_FAILURE_WEBHOOK}}