dnf5 - enable env groups testing in CI (#81032)

Implemented in https://github.com/rpm-software-management/dnf5/pull/585

changelogs/fragments/dnf5-test-env-groups.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - dnf5 - enable environment groups installation testing in CI as its support was added.

test/integration/targets/dnf/tasks/dnf.yml

@@ -530,7 +530,6 @@
     - dnf_result is changed
     - "'results' in dnf_result"
     - landsidescalping_result.rc == 0
-  when: not dnf5|default('false')
 
 # Fedora 28 (DNF 2) does not support this, just remove the package itself
 - name: remove landsidescalping package on Fedora 28