Fix cloud deploy script (#867)

The Python build tool does not handle symlinks. This eliminates the
dependency on the local code mgmt tool from the build script. It also
makes it clear where references to source dirs are actually required.
Once we start pulling `kagglesdk` from pypi.org then this will need to
change. At that time other changes will need to be made to this script
and it should be obvious where the current mod needs to be updated.

Author: stevemessick

tools/releases/cloudbuild.yaml

@@ -30,8 +30,8 @@ steps:
     args:
       - "-c"
       - |
-        mkdir -p ~/.kaggle/dev # Directory expected by following script
-        ./tools/GeneratePythonLibrary.sh
+        cp -r src/kaggle .
+        cp -r src/kagglesdk .
         python3 -m pip install build --break-system-packages
         python3 -m build
         # Move the built CLI to a volume that will survive to next steps.