chore: update kfp-kubernetes release scripts and instructions (#11191)

Signed-off-by: Chen Sun <chensun@users.noreply.github.com>

kubernetes_platform/python/RELEASE.md

@@ -21,8 +21,7 @@ Some steps require elevated permissions to push branches, publish the package, a
     Follow the instructions printed out by the script in Step 2, which explain how to push the branch to upstream.
 
     By the end, you
-    should have pushed a modified `__init__.py`, `conf.py`, `.gitignore`, and
-    two modified `.readthedocs.yml` files to the release branch.
+    should have pushed a modified `__init__.py`, `conf.py` (from Step 1), and `.gitignore`, `kubernetes_executor_config_pb2.py` and two modified `.readthedocs.yml` files (from Step 2) to the release branch.
 
 4.  [Requires credentials] Go to
     [readthedocs.org/projects/kfp-kubernetes/](https://readthedocs.org/projects/kfp-kubernetes/),

kubernetes_platform/python/create_release_branch.sh

@@ -48,6 +48,12 @@ else
     mv $PKG_ROOT/docs/.readthedocs.yml $REPO_ROOT/.readthedocs.yml
     rm $REPO_ROOT/kubernetes_platform/.gitignore
 
-
-    echo "\nNext steps:\n\tPush branch using 'git push --set-upstream upstream $BRANCH_NAME'"
+    git add $PKG_ROOT/docs/.readthedocs.yml
+    git add $REPO_ROOT/.readthedocs.yml
+    git add $REPO_ROOT/kubernetes_platform/.gitignore
+    git add $REPO_ROOT/*_pb2.py
+
+    echo "Next steps:"
+    echo "1. Inspect and commit the modified files."
+    echo "2. Push branch using 'git push --set-upstream upstream $BRANCH_NAME'"
 fi

kubernetes_platform/python/release.sh

@@ -43,7 +43,7 @@ else
     echo "Created package."
 
     echo "Testing install"
-    pip install $TARGET_TAR_FILE
+    pip install $TARGET_TAR_FILE --break-system-packages
     INSTALLED_VERSION=$(pip list | grep kfp-kubernetes | awk '{print $2}')
     if [[ "$INSTALLED_VERSION" != "$KFP_KUBERNETES_VERSION" ]]
     then