packit: Load fmf metadata from rpm spec repository

Maintaining the fmf metadata and script upstream makes it painful
to reuse downstream so let's move the metadata and testing script
downstream and load it upstream instead.

.packit.yml

@@ -37,8 +37,17 @@ jobs:
 
 - job: tests
   trigger: pull_request
-  fmf_path: test/fmf
-  tmt_plan: ci
-  use_target_repo_for_fmf_url: true
+  fmf_url: https://src.fedoraproject.org/rpms/systemd
+  # This is automatically updated by tools/fetch-distro.py --update fedora
+  fmf_ref: 2ecfbec1a444a2ec9e3dab91d04565330cf809ea
   targets:
   - fedora-rawhide-x86_64
+  # testing-farm in the Fedora repository is explicitly configured to use testing-farm bare metal runners as
+  # the volume of pull requests there is very low. Upstream the volume of pull requests is much higher and
+  # we'll bottleneck ourselves if we insist on bare metal runners, so explicitly do not request support for
+  # nested virtualization so we don't only consider bare metal runners.
+  tf_extra_params:
+    environments:
+      - hardware:
+          virtualization:
+            is-supported: false