run-k8s-e2e-tests.sh --e2e-all does not run any NetworkPolicy tests

[tnqn]

Describe the bug

run-k8s-e2e-tests.sh --e2e-all is supposed to run both Conformance and NetworkPolicy tests:

        --e2e-all                                                 Run both Conformance and Network Policy tests.

But actually it doesn't run any NetworkPolicy tests:

Running tests with sonobuoy. While test is running, check logs with: /usr/local/bin/sonobuoy  logs -f.
+ [[ \[Feature:NetworkPolicy\] == '' ]]
+ /usr/local/bin/sonobuoy run --wait --kube-conformance-image-version v1.19.4 --e2e-focus '\[Feature:NetworkPolicy\]' --e2e-skip '\[Slow\]|\[Serial\]|\[Disruptive\]|\[Flaky\]|\[Feature:.+\]|\[sig-cli\]|\[sig-storage\]|\[sig-auth\]|\[sig-api-machinery\]|\[sig-apps\]|\[sig-node\]|\[sig-instrumentation\]' --image-pull-policy Always --sonobuoy-image projects.registry.vmware.com/sonobuoy/sonobuoy:v0.19.0 --e2e-repo-config /root/antrea/ci/conformance-image-config.yaml
WARN[0000] The maximum supported Kubernetes version is 1.19.99, but the server version is v1.23.1. Sonobuoy will continue but unexpected results may occur.
INFO[0000] created object                                name=sonobuoy namespace= resource=namespaces
INFO[0000] created object                                name=sonobuoy-serviceaccount namespace=sonobuoy resource=serviceaccounts
INFO[0000] created object                                name=sonobuoy-serviceaccount-sonobuoy namespace= resource=clusterrolebindings
INFO[0000] created object                                name=sonobuoy-serviceaccount-sonobuoy namespace= resource=clusterroles
INFO[0000] created object                                name=sonobuoy-config-cm namespace=sonobuoy resource=configmaps
INFO[0000] created object                                name=sonobuoy-plugins-cm namespace=sonobuoy resource=configmaps
INFO[0000] created object                                name=sonobuoy namespace=sonobuoy resource=pods
INFO[0000] created object                                name=repolist-cm namespace=sonobuoy resource=configmaps
INFO[0000] created object                                name=sonobuoy-aggregator namespace=sonobuoy resource=services
+ set +x
Plugin: e2e
Status: passed
Total: 5234
Passed: 0
Failed: 0
Skipped: 5234

It was because run_conformance overrided the global RUN_E2E_SKIP variable with DEFAULT_E2E_CONFORMANCE_SKIP.

To Reproduce

Run ./ci/run-k8s-e2e-tests.sh --e2e-all

Expected

Actual behavior

Versions:

Please provide the following information:

• Antrea version (Docker image tag). ba9c7b3