ci: support openSUSE Leap in qemu/kvm test matrix

[richm]

Some of our system roles now support openSUSE Leap so add this
platform to our testing matrix.

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Add openSUSE Leap 15.6 to the qemu/kvm integration test matrix.

CI:

• Include leap-15.6 image with qemu-ansible-core-2.18 in the GitHub Actions workflow
• Update platform mapping logic to recognize leap-* images for openSUSE

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR enhances the qemu/kvm integration test workflow by adding openSUSE Leap 15.6 to the CI matrix and updating the job logic to correctly identify leap images as the ‘leap’ platform.

File-Level Changes

Change	Details	Files
Add openSUSE Leap 15.6 to the test matrix	Inserted leap-15.6 image with qemu-ansible-core-2.18 into the list of test images	.github/workflows/qemu-kvm-integration-tests.yml
Map leap-* images to the ‘leap’ platform	Extended the shell case statement to recognize leap-* images and set platform and platform_version accordingly	.github/workflows/qemu-kvm-integration-tests.yml

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