Removal of Airflow 1 support from official Helm Chart

[Miretpl]

Hi there,

Currently, the official Helm Chart still supports Airflow 1 version despite it being unsupported for many years. That makes Helm Chart template and tests more complicated than they need to be.

I'm willing to contribute this change to the code, but I'm unsure what the entire process should look like. If PRs for particular sections would be sufficient, or if there is a need for voting on the devlist (who should create it if so), and potentially other topics about which I am not aware. I would appreciate any help!

Before creating the first PRs and potentially converting this discussion topic to an issue, I can make a list of files where the changes are required for templates and tests.

[potiuk]

Great idea. I think it might be good if you start discussion on devlist. Fantastic that you would like to start to work on it.

[Miretpl]

Thank you for the reply. I started a discussion on devlist here https://lists.apache.org/thread/2h8bsgotk9o5tjsy1oqw7h7ky8999m7w.

I read some existing documentation, e.g., here https://github.com/apache/airflow/blob/main/contributing-docs/02_how_to_communicate.rst#devlist-details. Is there a strict amount of time which should pass after the discussion (with no new responses, I suppose) before starting voting (lazy consensus if everyone is on board)?

[potiuk]

Anyone LITERALLY Anyone can start discussion and run VOTE on the devlist (but I have a feeling everyone will be 100% on board and it will be enough to sent LAZY CONSENSUS after initial discussion.