fix: Skip ClusterServingRuntime deletion if deployed using --namespace-scope-mode

[rafvasq]

Motivation

delete.sh script attempts to delete ClusterServingRuntime resources when they don't exist after deploying with --namespace-scope-mode, interrupting the script and leaving multiple resources behind.

Modifications

Set and use NAMESPACE_SCOPE env variable to check whether to skip ClusterServingRuntime deletion.

Result

Resolves #420

[ckadner]

Hi @rafvasq -- I think the way we define and test for the is_namespace_scoped variable needs to be hardened a bit

[ckadner]

  echo false

🙃

[ckadner]

/lgtm
/approve

[kserve-oss-bot]

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[ckadner]

Thanks @rafvasq