Avoid additional serialization/deserialization of response bodies

[prochnowc]

Fixes #1371

This PR adds additional overloads with generic type argument to all operations which return object.

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[prochnowc]

The e2e test worked fine on my local machine.

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[tg123]

/LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: prochnowc, tg123

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