Added event trigger for pre-releases (#33200)

* Added event trigger for pre-releases

When a woocommece pre-release occurs, this workflow will trigger a testing event in another repo defined using project secrets.

* Set to only fire on prereleases

* Updated run condition

* Fixed run condition

.github/workflows/build-release.yml

@@ -61,3 +61,18 @@ jobs:
           token: ${{ secrets.E2E_WORKFLOW_GH_TOKEN }}
           ref: refs/heads/trunk
           inputs: '{ "release_id": "${{ github.event.release.id }}" }'
+  send-release-notification:
+    if: github.event.release.prerelease == true && github.event.release.draft == false && github.event.release.tag_name != 'nightly' 
+    name: Send Release Notification
+    needs: build
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Invoke Pre-Release Event
+        uses: aurelien-baudet/workflow-dispatch@v2
+        with:
+          workflow: ${{ secrets.CD_RELEASE_NOTIFICATION_WORKFLOW }}
+          repo: ${{ secrets.CD_NOTIFICATION_REPO }}
+          token: ${{ secrets.CD_GH_TOKEN }}
+          ref: refs/heads/trunk
+          inputs: '{ "tag_name": "${{ github.event.release.tag_name }}" }'
+