[AIRFLOW-6692] Generate excluded_patterns in docs/conf.py

[mik-laj]

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Issue link: AIRFLOW-6692

Make sure to mark the boxes below before creating PR: [x]

• Description above provides context of the change
• Commit message/PR title starts with [AIRFLOW-NNNN]. AIRFLOW-NNNN = JIRA ID^*
• Unit tests coverage for changes (not needed for documentation changes)
• Commits follow "How to write a good git commit message"
• Relevant documentation is updated including usage instructions.
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^* For document-only changes commit message can start with [AIRFLOW-XXXX].

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In case of backwards incompatible changes please leave a note in UPDATING.md.
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[codecov-io]

Codecov Report

Merging #7304 into master will increase coverage by 53.63%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #7304       +/-   ##
===========================================
+ Coverage    32.4%   86.04%   +53.63%     
===========================================
  Files         866      866               
  Lines       40556    40555        -1     
===========================================
+ Hits        13144    34894    +21750     
+ Misses      27412     5661    -21751

Impacted Files	Coverage Δ
...enkins/example_dags/example_jenkins_job_trigger.py	65% <ø> (ø)
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%> (-43.8%)	⬇️
airflow/kubernetes/refresh_config.py	50.98% <0%> (-23.53%)	⬇️
...viders/cncf/kubernetes/operators/kubernetes_pod.py	76.47% <0%> (-21.18%)	⬇️
airflow/plugins_manager.py	86.98% <0%> (-1.45%)	⬇️
airflow/executors/executor_loader.py	78.94% <0%> (ø)	⬆️
airflow/bin/airflow	84.61% <0%> (ø)	⬆️
airflow/bin/cli.py	94.73% <0%> (+2.1%)	⬆️
... and 738 more

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[potiuk]

Love it!