Add v1beta1 test to Kind (#12347)

This patch changes kind e2e:

- to use `./test/conformance/api/` by `./test/conformance/api/...` as `v1beta1` was missed.
- to add `--enable-alpha` and `--enable-beta` by default as `enable-beta` was missed.

.github/workflows/kind-e2e.yaml

@@ -24,8 +24,7 @@ jobs:
 
         test-suite:
         - ./test/conformance/runtime
-        - ./test/conformance/api/v1
-        - ./test/conformance/api/v1alpha1
+        - ./test/conformance/api/...
         - ./test/e2e
 
         include:
@@ -48,11 +47,6 @@ jobs:
           kingress: istio
           cluster-suffix: c${{ github.run_id }}.local
 
-          # The tests in api/v1alpha1 require the --enable-alpha flag to be set,
-          # and alpha components to be deployed.
-        - test-suite: ./test/conformance/api/v1alpha1
-          test-flags: "--enable-alpha"
-
     env:
       GOPATH: ${{ github.workspace }}
       GO111MODULE: on
@@ -207,4 +201,4 @@ jobs:
         # Run the tests tagged as e2e on the KinD cluster.
         go test -race -count=1 -timeout=20m -tags=e2e ${{ matrix.test-suite }} \
            --ingressendpoint="${IPS[0]}" \
-           ${{ matrix.test-flags }}
+           --enable-alpha --enable-beta