fix: Support OPA for Airflow when user role is not 'Admin'

[sweb]

Description

Fixes an issue in the Airflow 3 OPA auth manager that broke non-Admin users:

• DAG listings and menu items were empty for users without Flask AppBuilder DB roles

While also relevant for Airflow 2, I opted to only adjust it for Airflow 3. If required, I can look into Airflow 2 as a follow up.

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 (see chore: add test to reproduce Airflow / OPA interop issue airflow-operator#800)

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>.

[razvan]

LGTM, nice work with the tests. One conflict needs to be fixed before merge though.

[razvan]

lgtm