Don't skip external net test in external net E2E

The current Shipyard default is to skip tests labled external-dataplane.
Override this in tests that are meant to test external networks.

Signed-off-by: Daniel Farrell <dfarrell@redhat.com>

.github/workflows/e2e-full.yml

@@ -56,3 +56,4 @@ jobs:
         uses: submariner-io/shipyard/gh-actions/e2e@devel
         with:
           using: ${{ matrix.external_net }} ${{ matrix.globalnet }}
+          skip: ""