Add explaining comments to manual comps creation

Author: kontura

dnf-behave-tests/dnf/comps-environment-list.feature

@@ -3,6 +3,9 @@ Feature: Tests for environment list and info commands
 
 Background: Enable repo and mark an environment as installed
  Given I use repository "comps-group-list"
+   # Create the installed environment manually so the test can be
+   # used by dnf5daemon because it doesn't implement the environment
+   # install command yet.
    And I create file "/usr/lib/sysimage/libdnf5/environments.toml" with
        """
        version = "1.0"

dnf-behave-tests/dnf/comps-group-list.feature

@@ -3,6 +3,9 @@ Feature: Tests for group list and info commands
 
 Background: Enable repo and mark a group as installed
  Given I use repository "comps-group-list"
+ # Create the installed group manually so the test can be
+ # used by dnf5daemon because it doesn't implement the group
+ # install command yet.
  Given I create file "/usr/lib/sysimage/libdnf5/groups.toml" with
     """
     version = "1.0"