Packit: re-enable CentOS Stream jobs on PRs

Does not affect propose_downstream jobs.

Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com>

.packit.yaml

@@ -54,9 +54,8 @@ jobs:
           - "https://kojipkgs.fedoraproject.org/repos/eln-build/latest/aarch64/"
     enable_net: true
 
-  # Ignore until golang is updated in distro buildroot to go 1.23.3+
   - job: copr_build
-    trigger: ignore
+    trigger: pull_request
     packages: [skopeo-centos]
     notifications: *copr_build_failure_notification
     targets: &centos_copr_targets
@@ -105,9 +104,8 @@ jobs:
             id: https://copr.fedorainfracloud.org/coprs/rhcontainerbot/podman-next/repo/fedora-eln/rhcontainerbot-podman-next-fedora-eln.repo
 
   # Tests on CentOS Stream for main branch
-  # Ignore until golang is updated in distro buildroot to go 1.23.3+
   - job: tests
-    trigger: ignore
+    trigger: pull_request
     packages: [skopeo-centos]
     notifications: *test_failure_notification
     targets: *centos_copr_targets