[4.18][Storage] Storage Tier2: use DataSource instead of artifactory in test_wffc.py 4.18

[acinko-rh]

…t_wffc.py (#4368)

Use DataSource instead of artifactory in test_wffc.py

https://redhat.atlassian.net/browse/CNV-83360

Currently, most storage tests use import from HTTP as the default method to deploy DataVolumes/VMs.

Switching to golden images (except for tests that explicitly validate the import workflow) will improve test stability and reduce flakiness.

Acceptance criteria:

Update storage tests to use golden image as the default deployment method.

Keep HTTP import only for tests explicitly covering import functionality.

In test_wffc.py the tests are using HTTP to create DVs which can make them fail when the requrest for the image is unsuccessful.

Don't hold out on critisism, I'm new and I want to get better.

• Tests
• Switched storage tests to use RHEL images and updated VM memory to match RHEL.
• Replaced external-image/template workflow with a blank-source DataVolume flow and added reusable blank DV and DV-template fixtures.
• Consolidated storage-class selection into a single module-scoped fixture and improved virtctl/upload wiring.
  • Simplified runtime waiting and VMI status handling.
• Removed two obsolete registry/clone tests and updated affected test parametrization.

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[openshift-virtualization-qe-bot-4]

Clean rebase detected — no code changes compared to previous head (9bced41).

[josemacassan]

/lgtm

[acinko-rh]

/build-and-push-container