test: use internal teseing farm

To workaround issue https://issues.redhat.com/browse/TFT-2691

Signed-off-by: Xiaofeng Wang <[email protected]>

.packit.yaml

@@ -61,15 +61,17 @@ jobs:
     tmt_plan: /integration-build
     skip_build: true
     identifier: integration-test
+    use_internal_tf: true
 
   - job: tests
     trigger: pull_request
     targets:
       - centos-stream-9-x86_64
       - centos-stream-9-aarch64
-      - fedora-40-aarch64
+      - fedora-40-x86_64
     tmt_plan: /to-existing-root
     identifier: e2e-test-to-existing-root
+    use_internal_tf: true
 
   - job: tests
     trigger: pull_request
@@ -79,3 +81,4 @@ jobs:
       - fedora-40-aarch64
     tmt_plan: /to-disk
     identifier: e2e-test-to-disk
+    use_internal_tf: true