[GitHub] [airflow] chronitis opened a new pull request #5230: [AIRFLOW-1501] Add GoogleCloudStorageDeleteOperator

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chronitis opened a new pull request #5230: [AIRFLOW-1501] Add GoogleCloudStorageDeleteOperator
URL: https://github.com/apache/airflow/pull/5230
 
 
   ### Jira
   
   - [x] My PR addresses https://issues.apache.org/jira/browse/AIRFLOW-1501
   
   This has been previously marked as `Fixed` (a year ago), but no operator appears to either exist in `master` or in any current PR (although delete is supported by the GCS hook).
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   Creates `GoogleCloudStorageDeleteOperator`, which (analogously to the existing S3 object delete operator), exposes the `delete` function of the GCS hook as an operator supporting templating and deletion either by a list of objects or all objects matching a prefix.
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   `tests/contrib/operators/test_gcs_delete_operator.py`
   
   ### Commits
   
   - [x] 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](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [x] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   ### Code Quality
   
   - [x] Passes `flake8`
   

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