Packit: Reuse Fedora targets wherever possible

This commit uses 2 anchors, `fedora_copr_targets` and `fedora_targets`
for copr and downstream jobs respectively.

Signed-off-by: Lokesh Mandvekar <[email protected]>

.packit.yaml

@@ -48,7 +48,7 @@ jobs:
     notifications: &copr_build_failure_notification
       failure_comment:
         message: "Ephemeral COPR build failed. @containers/packit-build please check."
-    targets:
+    targets: &fedora_copr_targets
       - fedora-all-x86_64
       - fedora-all-aarch64
 
@@ -102,9 +102,7 @@ jobs:
     notifications: &podman_system_test_fail_notification
       failure_comment:
         message: "podman system tests failed. @containers/packit-build please check."
-    targets:
-      - fedora-all-x86_64
-      - fedora-all-aarch64
+    targets: *fedora_copr_targets
     tf_extra_params:
       environments:
         - artifacts:
@@ -146,7 +144,7 @@ jobs:
   - job: propose_downstream
     trigger: release
     packages: [crun-fedora]
-    dist_git_branches:
+    dist_git_branches: &fedora_targets
       - fedora-all
 
   - job: propose_downstream
@@ -157,8 +155,7 @@ jobs:
 
   - job: koji_build
     trigger: commit
-    dist_git_branches:
-      - fedora-all
+    dist_git_branches: *fedora_targets
 
   - job: bodhi_update
     trigger: commit