[AIRFLOW-6451] self._print_stat() in dag_processing.py should be skippable

[tooptoop4]

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Issue link: AIRFLOW-6451

• [X ] Description above provides context of the change
• [ X] Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
• [ X] Unit tests coverage for changes (not needed for documentation changes)
• [X ] Commits follow "How to write a good git commit message"
• [ X] Relevant documentation is updated including usage instructions.
• [ X] I will engage committers as explained in Contribution Workflow Example.

^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in UPDATING.md.
Read the Pull Request Guidelines for more information.

[tooptoop4]

@ashb

[codecov-io]

Codecov Report

Merging #7134 into master will decrease coverage by 0.21%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #7134      +/-   ##
==========================================
- Coverage   85.17%   84.96%   -0.22%     
==========================================
  Files         683      683              
  Lines       39155    39152       -3     
==========================================
- Hits        33352    33264      -88     
- Misses       5803     5888      +85

Impacted Files	Coverage Δ
airflow/utils/dag_processing.py	87.93% <100%> (-0.07%)	⬇️
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	78.31% <0%> (-20.49%)	⬇️
airflow/hooks/postgres_hook.py	94.36% <0%> (+1.4%)	⬆️
airflow/hooks/dbapi_hook.py	91.73% <0%> (+1.65%)	⬆️
airflow/utils/sqlalchemy.py	96.66% <0%> (+1.66%)	⬆️
airflow/operators/postgres_operator.py	100% <0%> (+100%)	⬆️

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[tooptoop4]

@mik-laj pls merge