fix: use proper matrix format for exclude functionality

- Add base matrix dimensions (k8s-version, distribution) for exclude to work
- Keep include section to add specific configurations (nodes, instance-type, timeout)
- Fix Matrix exclude key error by providing matching base matrix keys
- Enable proper exclusion of v1.31.2 EKS combination

Generated with code assistance

Co-Authored-By: Assistant <[email protected]>

Author: adamancini

.github/workflows/wg-easy-pr-validation.yaml

@@ -162,6 +162,8 @@ jobs:
     needs: [setup, create-release]
     strategy:
       matrix:
+        k8s-version: ["v1.31.2", "v1.32.2"]
+        distribution: ["k3s", "kind", "eks"]
         include:
           # k3s single-node configurations
           - k8s-version: "v1.31.2"
@@ -207,9 +209,6 @@ jobs:
           # These can be re-enabled as distributions gain support
           - k8s-version: "v1.31.2"
             distribution: "eks"
-            nodes: 2
-            instance-type: "r1.medium"
-            timeout-minutes: 30
       fail-fast: false
       max-parallel: 4
     outputs: