Add minimal functionality test for k8s control plane

Basic functionality test that sends the bootstrap RPC call,
waits for the k8s control plane to come up and runs a simple
kubectl command (that is expected to fail).

Adds reflection to the server to make grpc_cli easier to use.

Test Plan:
Ran `:launch` (because we modified its config) and `:test_boot`,
saw a nicely booted k8s cluster:

{P90}

X-Origin-Diff: phab/D275
GitOrigin-RevId: fe01e3f3ed09877aa76c15946664c9d9bdc4751b
diff --git a/BUILD b/BUILD
index 20812a2..44bb617 100644
--- a/BUILD
+++ b/BUILD
@@ -11,6 +11,14 @@
 alias(
     name = "go",
     actual = "@go_sdk//:bin/go",
+    visibility = ["//visibility:public"],
+)
+
+# Shortcut for kubectl
+alias(
+    name = "kubectl",
+    actual = "@kubernetes//cmd/kubectl:kubectl",
+    visibility = ["//visibility:public"],
 )
 
 # nogo linters