[AIRFLOW] fix: Proceed without rendering templates if task_instance copy fails

[kacpermuda]

Problem

In listener's on_task_instance_running method, we are working on task_instance copy when rendering templates. Sometimes making a copy can fail, if there are some objects that cannot be pickled and copied with copy.deepcopy().

Solution

I think we have two options if copying fails:

1. Skip rendering templates
2. Render templates on task_instance and not the copy.

This PR implements the first one, as the second one can lead to this issue.

One-line summary:

Proceed without rendering templates if task_instance copy fails in listener.on_task_instance_running.

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