Merge pull request #6585 from k0sproject/backport-6584-to-release-1.34

[Backport release-1.34] Set E2E_SKIP to the empty string when running conformance tests

Author: jnummelin

.github/workflows/ostests-e2e.yaml

@@ -199,6 +199,7 @@ jobs:
           bin/sonobuoy run -p e2e --wait=150 \
             --kubernetes-version=v"$KUBERNETES_VERSION" \
             --plugin-env=e2e.E2E_FOCUS="$E2E_FOCUS" \
+            --plugin-env=e2e.E2E_SKIP='' \
             --plugin-env=e2e.E2E_EXTRA_GINKGO_ARGS='-v --timeout=120m'
 
       - name: "e2e tests :: Retrieve serial results"