fix: reduce airflow/superset image size

[dervoeti]

Description

Since #1304 we build Airflow and Superset from source.

This is a follow up PR that fixes two things:

1. Reduce image size by removing the source and intermediate build files
2. Add a snapshot of the source code including patches into the container, like we do for other products

I built Superset 4.1.4 and Airflow 3.0.6 and ran the smoke tests, which passed successfully.

Definition of Done Checklist

Note

Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant.

Please make sure all these things are done and tick the boxes

• Changes are OpenShift compatible
• All added packages (via microdnf or otherwise) have a comment on why they are added
• Things not downloaded from Red Hat repositories should be mirrored in the Stackable repository and downloaded from there
• All packages should have (if available) signatures/hashes verified
• Add an entry to the CHANGELOG.md file
• Integration tests ran successfully

TIP: Running integration tests with a new product image

The image can be built and uploaded to the kind cluster with the following commands:

boil build <IMAGE> --image-version <RELEASE_VERSION> --strip-architecture --load
kind load docker-image <MANIFEST_URI> --name=<name-of-your-test-cluster>

See the output of boil to retrieve the image manifest URI for <MANIFEST_URI>.

[maltesander]

Thanks, LGTM!