[AIRFLOW-6049] set propagate True when needed in airflow test

[pingzh]

when airflow.task handlers don't have StreamHandler

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Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
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Description

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When the log handler of airflow.task is already a subclass of StreamHandler, the propagate = True will double log.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Tested in the CLI run.

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Documentation

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@KevinYang21 @saguziel

[codecov-io]

Codecov Report

Merging #6647 into master will decrease coverage by 0.31%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master    #6647      +/-   ##
==========================================
- Coverage   83.79%   83.47%   -0.32%     
==========================================
  Files         672      672              
  Lines       37567    37574       +7     
==========================================
- Hits        31478    31365     -113     
- Misses       6089     6209     +120

Impacted Files	Coverage Δ
airflow/cli/commands/task_command.py	63.5% <87.5%> (+1.19%)	⬆️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	76.38% <0%> (-22.23%)	⬇️
airflow/configuration.py	89.13% <0%> (-3.63%)	⬇️
airflow/utils/dag_processing.py	58.31% <0%> (+0.16%)	⬆️

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[ashb]

@pingzh When/how do you get this logging config set like this?