[AIRFLOW-5775] Migrate AWS Batch components to /providers/aws [AIP-21]

[BasPH]

Make sure you have checked all steps below.

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-5775
  • In case you are fixing a typo in the documentation you can prepend your commit with [AIRFLOW-XXX], code changes always need a Jira issue.
  • In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal (AIP).
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Tests

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

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Documentation

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[feluelle]

I looked at the failing tests. There is one mock.patch you forgot to update.

- @mock.patch('airflow.contrib.operators.awsbatch_operator.AwsHook')
+ @mock.patch('airflow.providers.aws.operators.batch.AwsHook')

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.