Add support for Job rendering with user-provided Node data

[pawiecz]

This task focuses on enabling Job generation dry-runs in kci tool.

Related issues:

• https://github.com/kernelci/kernelci-pipeline/pull/623#issuecomment-2147008153
• https://github.com/kernelci/kernelci-pipeline/pull/660#issuecomment-2191323951
• https://github.com/kernelci/kernelci-core/issues/2591