Add flag to keep the resources from notebooks

[misohu]

Context

While debugging UATs its hard to get some debug logs as all of the resources are removed after the tests are finished. We want to add a flag to the UATs to keep them after notebook execution.

This change requires to pass env variable to the notebook and we need to check this variable in notebook cell before removing resources.

What needs to get done

Implement keep-resources flag.

Definition of Done

Flag is added

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6330.

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