CI/molecule: use common vars as well and simplify run (#13520)

The molecule_run.sh isn't really needed since the switch to gitlab-ci
matrix runs.

Also use the inventory variables pattern for kata-containers.

roles/container-engine/kata-containers/molecule/default/verify.yml

@@ -3,6 +3,15 @@
   hosts: all
   gather_facts: false
   tasks:
+  - name: Get kubespray defaults
+    import_role:
+      name: ../../../../../kubespray_defaults
+  - name: Get OS facts (needed for bin_dir resolution)
+    setup:
+      gather_subset:
+      - '!all'
+      - '!min'
+      - 'distribution'
   - name: Test version
     command: "/opt/kata/bin/kata-runtime version"
     register: version