Use matrix exclude instead of if conditions

Author: shayancanonical

.github/workflows/ci.yaml

@@ -116,7 +116,9 @@ jobs:
           - juju-snap-channel: "2.9/stable"
             agent-version: "2.9.45"
             libjuju-version:  "2.9.44.1"
-    if: (! (${{ matrix.groups.path_to_test_file }} == "tests/integration/test_data_integrator.py" && ${{ matrix.ubuntu-versions.series == "focal" }}))
+        exclude:
+          - groups.path_to_test_file: "tests/integration/test_data_integrator.py"
+            ubuntu-versions.series: "focal"
     name: ${{ matrix.juju-snap-channel }} - (GH hosted) ${{ matrix.groups.job_name }} | ${{ matrix.ubuntu-versions.series }}
     needs:
       - lint