Describe the issue
Current apache helm-chart lists redis as installation enabled but is not actually required when using the kubernetes executor, we should update to false.
https://github.com/elyra-ai/elyra/blob/dcb63e72c12f7e143ca5262f2140a3387f8abd10/etc/kubernetes/airflow/helm/values.yaml#L1420-L1427

To Reproduce

Screenshots or log output
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Summary

The current implementation does not allow creating templates specifying the parallelism field as per the Argo spec.

Use Cases

Many possible use cases, my current one is limiting the amount of parallel nodes running a certain template so as to save

Currently the env variables injected are specific to this docker image https://github.com/barney-s/docker-airflow

Align it with https://github.com/puckel/docker-airflow and make necessary changes in the operator to make it work with both.

related to GoogleCloudPlatform/airflow-operator#10