fix: remove command from the workloads

This commits removes the command from workloads yamls. This is because
now the spin image has an explicit entrypoint pointing to a
executable wasm module, which is required by the libcontainer.

I am expecting that this will go away with futuer iteration of the
libcontainer

Signed-off-by: jiaxiao zhou <jiazho@microsoft.com>

deployments/k3d/workload/workload.yaml

@@ -57,7 +57,6 @@ spec:
         - name: spin-hello
           imagePullPolicy: Never
           image: wasmtest_spin:latest
-          command: ["/"]
 ---
 apiVersion: v1
 kind: Service

tests/workloads/workload.yaml

@@ -57,7 +57,6 @@ spec:
         - name: testwasm
           image: docker.io/library/spin-hello-world:latest
           imagePullPolicy: Never # prevent k8s from pulling the image from a registry
-          command: ["/"]
           resources: # limit the resources to 128Mi of memory and 100m of CPU
             limits:
               cpu: 100m