ci: add path filters to skip KinD e2e on unrelated changes

The KinD e2e matrix (3 test suites × 2 k8s versions) currently fires on
every PR regardless of what changed. Restricting it to paths that can
actually affect runtime behaviour — Go source, go.mod/sum, config/,
test/, and the workflow file itself — avoids wasting ~6 parallel
runner-hours on documentation or tooling-only changes.

The e2e-tests check is not a required status check on the upstream
repo (Prow handles gating), so a skipped run on docs-only PRs does
not block merging.

Made-with: Cursor

Author: Ankitsinghsisodya

.github/workflows/kind-e2e.yaml

@@ -3,6 +3,13 @@ name: KinD e2e tests
 on:
   pull_request:
     branches: [ 'main', 'master' ]
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - 'config/**'
+      - 'test/**'
+      - '.github/workflows/kind-e2e.yaml'
 
 defaults:
   run: