ci: use the new epel feature to enable EPEL for testing farm

Now that https://github.com/teemtee/tmt/pull/3128 has merged
we can use the new epel feature to enable EPEL for testing farm

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

plans/test_playbooks_parallel.fmf

@@ -31,15 +31,6 @@ prepare:
       if grep -q 'CentOS Linux release 7.9' /etc/redhat-release; then
         sed -i '/^mirror/d;s/#\?\(baseurl=http:\/\/\)mirror/\1vault/' /etc/yum.repos.d/*.repo
       fi
-  # Replace with feature: epel: enabled once https://github.com/teemtee/tmt/pull/3128 is merged
-  - name: Enable epel to install beakerlib
-    script: |
-      # CS 10 and Fedora doesn't require epel
-      if grep -q -e 'CentOS Stream release 10' -e 'Fedora release' /etc/redhat-release; then
-        exit 0
-      fi
-      yum install epel-release yum-utils -y
-      yum-config-manager --enable epel epel-debuginfo epel-source
 discover:
   - name: Prepare managed node
     how: fmf
@@ -62,5 +53,11 @@ discover:
   #   filter: tag:reserve_system
   #   url: https://github.com/linux-system-roles/tft-tests
   #   ref: main
+adjust:
+  - when: distro == rhel-9 or distro == centos-stream-9 or distro == rhel-10 or distro == centos-stream-10
+    prepare+:
+      - how: feature
+        epel: enabled
+        order: 10
 execute:
-    how: tmt
+  how: tmt