[AIRFLOW-6674] Move example_dags in accordance with AIP-21

[mik-laj]

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Issue link: AIRFLOW-6674

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• Description above provides context of the change
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In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
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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 #7287 into master will decrease coverage by 1.65%.
The diff coverage is 65.3%.

@@            Coverage Diff             @@
##           master    #7287      +/-   ##
==========================================
- Coverage    85.5%   83.85%   -1.66%     
==========================================
  Files         864      863       -1     
  Lines       40455    40488      +33     
==========================================
- Hits        34592    33951     -641     
- Misses       5863     6537     +674

Impacted Files	Coverage Δ
...ders/databricks/example_dags/example_databricks.py	100% <ø> (ø)
...irflow/example_dags/example_kubernetes_executor.py	80.95% <ø> (ø)
...rnetes/example_dags/example_kubernetes_operator.py	78.57% <ø> (ø)
...ders/microsoft/winrm/example_dags/example_winrm.py	100% <ø> (ø)
...oviders/http/example_dags/example_http_operator.py	100% <ø> (ø)
...rs/apache/hive/example_dags/example_twitter_dag.py	100% <ø> (ø)
...ers/qubole/example_dags/example_qubole_operator.py	90% <ø> (ø)
.../example_dags/example_emr_job_flow_manual_steps.py	100% <ø> (ø)
...s/google/cloud/example_dags/example_gcs_to_sftp.py	100% <ø> (ø)
...google/suite/example_dags/example_gcs_to_gdrive.py	100% <ø> (ø)
... and 64 more

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