chore: further simplify v2 simple dspa example.

[HumairAK]

Testing instructions

make deploy argodeploy
oc new-project kubeflow
make deploy
oc -n kubeflow apply -f config/samples/dspa_simple_v2.yaml
# run the iris pipeline, it should complete successfully

[amadhusu]

/lgtm

[openshift-ci]

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