Basic test case: test in internal TF

This test case is triggered automatically by our validation script.

```yaml
- job: copr_build
  trigger: pull_request
  metadata:
    targets:
    - fedora-all

- job: tests
  trigger: pull_request
  metadata:
    targets:
    - fedora-all
  use_internal_tf: True
```

.packit.yaml

@@ -14,8 +14,7 @@ jobs:
   trigger: pull_request
   metadata:
     targets:
-    - fedora-stable-x86_64
-    - fedora-rawhide-x86_64
+    - fedora-all
 
 - job: copr_build
   trigger: release
@@ -34,8 +33,8 @@ jobs:
   trigger: pull_request
   metadata:
     targets:
-    - fedora-stable-x86_64
-    - fedora-rawhide-x86_64
+    - fedora-all
+    use_internal_tf: True
 
 - job: propose_downstream
   trigger: release