[virt facts] identify KubeVirt properly (#72092)

Change:
- Make KubeVirt be identified as such, and with a guest role.
- This is a breaking change, since playbooks could be relying on the
  incorrect behavior previously.

Test Plan:
- Issue author

Tickets:
- Fixes #72001

Signed-off-by: Rick Elrod <rick@elrod.me>

changelogs/fragments/kubevirt-virt-fact.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - virtual facts - kubevirt is now identified as "KubeVirt" and with a "guest" role instead of "kvm" and "host" role (https://github.com/ansible/ansible/issues/72001).

lib/ansible/module_utils/facts/virtual/linux.py

@@ -187,6 +187,12 @@ class LinuxVirtual(Virtual):
                 virtual_facts['virtualization_type'] = 'kvm'
                 found_virt = True
 
+        if sys_vendor == 'KubeVirt':
+            guest_tech.add('KubeVirt')
+            if not found_virt:
+                virtual_facts['virtualization_type'] = 'KubeVirt'
+                found_virt = True
+
         # FIXME: This does also match hyperv
         if sys_vendor == 'Microsoft Corporation':
             guest_tech.add('VirtualPC')