feat: auto generate release notes (#873)

Signed-off-by: Eitan Yarmush <eitan.yarmush@solo.io>

Author: EItanya

.github/workflows/tag.yaml

@@ -139,6 +139,7 @@ jobs:
       uses: softprops/action-gh-release@v2
       if: startsWith(github.ref, 'refs/tags/')
       with:
+        generate_release_notes: true
         files: |
           go/bin/kagent-*
           kagent-*.tgz