Add CI on Zephyr (#4336)

to run product-mini/platforms/zephyr/simple and
product-mini/platforms/zephyr/user-mode

Construct a T2 (star topology) for the current smoke test. This is not the
final topology, and we may modify it once we determine the optimal
configuration.

product-mini/platforms/zephyr/simple/west_lite.yml

@@ -8,8 +8,8 @@ manifest:
       url: https://github.com/zephyrproject-rtos/zephyr
       revision: v3.7.0
       clone-depth: 1
-      path: modules/zephyr
+      path: zephyr
       west-commands: scripts/west-commands.yml
 
   self:
-    path: smoke-test
+    path: application