[AIRFLOW-5696] GoogleCloudStorageToSFTPOperator

[TobKed]

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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-5696
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Description

• Here are some details about my PR, including screenshots of any UI changes:

Tests

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

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
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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 #6366 into master will decrease coverage by 0.24%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6366      +/-   ##
==========================================
- Coverage   80.49%   80.24%   -0.25%     
==========================================
  Files         616      618       +2     
  Lines       35822    35927     +105     
==========================================
- Hits        28834    28829       -5     
- Misses       6988     7098     +110

Impacted Files	Coverage Δ
airflow/operators/gcs_to_sftp.py	100% <100%> (ø)
airflow/example_dags/example_gcs_to_sftp.py	100% <100%> (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%> (-46.72%)	⬇️
airflow/kubernetes/kube_client.py	33.33% <0%> (-41.67%)	⬇️
...rflow/contrib/operators/kubernetes_pod_operator.py	70.14% <0%> (-28.36%)	⬇️
airflow/gcp/hooks/base.py	96.95% <0%> (-0.26%)	⬇️
airflow/utils/dag_processing.py	58.4% <0%> (-0.17%)	⬇️
airflow/gcp/hooks/text_to_speech.py	100% <0%> (ø)	⬆️
... and 9 more

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