[AIRFLOW-6377] Decouple CLI utils from argparse.Namespace

[mik-laj]

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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"
  • https://issues.apache.org/jira/browse/AIRFLOW-6377
  • In case you are fixing a typo in the documentation you can prepend your commit with [AIRFLOW-XXX], code changes always need a Jira issue.
  • In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal (AIP).
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Description

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Tests

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

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  4. Subject uses the imperative mood ("add", not "adding")
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Documentation

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[codecov-io]

Codecov Report

Merging #6934 into master will decrease coverage by 0.28%.
The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master    #6934      +/-   ##
==========================================
- Coverage   84.71%   84.42%   -0.29%     
==========================================
  Files         679      679              
  Lines       38518    38521       +3     
==========================================
- Hits        32630    32522     -108     
- Misses       5888     5999     +111

Impacted Files	Coverage Δ
airflow/cli/commands/dag_command.py	86.61% <100%> (ø)	⬆️
airflow/cli/commands/task_command.py	68.11% <71.42%> (ø)	⬆️
airflow/utils/cli.py	74.48% <92.3%> (-0.25%)	⬇️
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	78.75% <0%> (-20%)	⬇️
airflow/contrib/operators/ssh_operator.py	83.33% <0%> (-1.29%)	⬇️
airflow/jobs/backfill_job.py	91.88% <0%> (+0.28%)	⬆️

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[mik-laj]

Merged: 4fd3b89