Move images needed only during CI to airflow-ci DockerHub

[potiuk]

We have now separate apache/airflow-ci DockerHub repo and we
move all our images needed only during CI there.

The images from the main apache/airflow remaining are:

• airflow tagged and latest tagged production images
• images neded by the Helm Chart

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Read the Pull Request Guidelines for more information.
In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in UPDATING.md.

[potiuk]

Random errors . Should be ok to merge @ashb and I can move to master -> main move then :)

[ashb]

Let infra team rename the branches, yes?

[github-actions]

The PR most likely needs to run full matrix of tests because it modifies parts of the core of Airflow. However, committers might decide to merge it quickly and take the risk. If they don't merge it quickly - please rebase it to the latest master at your convenience, or amend the last commit of the PR, and push it with --force-with-lease.

[potiuk]

Let infra team rename the branches, yes?

Yeah. Let's do it. And I will push a PR changing the rest. This will break everyone's PRs but I think we won't avoid disruption. Just thinking. The main branch will not be protected for a while, but It's good as we might need to push a change to `main' directly to fix something.