[AIRFLOW-2692] Add job_name as templated parameter in AWS Batch Operator

[craigforster]

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-2692
  • 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.

Description

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

When using the AWS Batch Operator, having the job_name field be templated allows easier traceability in the AWS console of which jobs were triggered by which Airflow task instance. In particular, I see using {{ ds_nodash }} as being used heavily in my deployments.

Tests

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

Updated existing test case to check for new field.

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
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added.

Code Quality

• Passes git diff upstream/master -u -- "*.py" | flake8 --diff

[codecov-io]

Codecov Report

Merging #3557 into master will decrease coverage by 58.93%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #3557       +/-   ##
==========================================
- Coverage   76.83%   17.9%   -58.94%     
==========================================
  Files         204     204               
  Lines       15485   15485               
==========================================
- Hits        11898    2772     -9126     
- Misses       3587   12713     +9126

Impacted Files	Coverage Δ
airflow/operators/generic_transfer.py	0% <0%> (-100%)	⬇️
airflow/operators/sqlite_operator.py	0% <0%> (-100%)	⬇️
...low/example_dags/example_short_circuit_operator.py	0% <0%> (-100%)	⬇️
airflow/example_dags/example_docker_operator.py	0% <0%> (-100%)	⬇️
airflow/api/common/experimental/get_task.py	0% <0%> (-100%)	⬇️
...rflow/api/common/experimental/get_dag_run_state.py	0% <0%> (-100%)	⬇️
airflow/example_dags/docker_copy_data.py	0% <0%> (-100%)	⬇️
airflow/example_dags/example_http_operator.py	0% <0%> (-100%)	⬇️
airflow/www_rbac/widgets.py	0% <0%> (-100%)	⬇️
airflow/www_rbac/validators.py	0% <0%> (-100%)	⬇️
... and 158 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 284dbdb...b64bec7. Read the comment docs.

[Fokko]

LGTM