[nrfconnect] Remove shell initialization from chef app (#33924)

On Zephyr-based platforms, shell commands are initialized
automatically on the system boot so they don't have to be
manually registered.

In fact, initializing OpenThread CLI at this stage replaces
the SRP client callback registered by the Matter stack and
breaks SRP in chef app.

examples/chef/nrfconnect/main.cpp

@@ -15,8 +15,6 @@
  *    limitations under the License.
  */
 
-#include <lib/shell/Engine.h>
-
 #include <app/server/Dnssd.h>
 #include <lib/core/CHIPCore.h>
 #include <lib/support/Base64.h>
@@ -35,10 +33,6 @@
 
 #include <zephyr/logging/log.h>
 
-#if CONFIG_ENABLE_CHIP_SHELL || CONFIG_CHIP_LIB_SHELL
-#include <ChipShellCollection.h>
-#endif
-
 #ifdef CONFIG_CHIP_PW_RPC
 #include "Rpc.h"
 #endif
@@ -53,7 +47,6 @@
 LOG_MODULE_REGISTER(app, CONFIG_CHIP_APP_LOG_LEVEL);
 
 using namespace chip;
-using namespace chip::Shell;
 using namespace chip::DeviceLayer;
 
 namespace {
@@ -159,27 +152,7 @@ int main()
         ChipLogError(AppServer, "OpenBasicCommissioningWindow() failed");
     }
 
-#if CONFIG_CHIP_LIB_SHELL
-    int rc = Engine::Root().Init();
-    if (rc != 0)
-    {
-        ChipLogError(AppServer, "Streamer initialization failed: %d", rc);
-        return 1;
-    }
-
-    cmd_misc_init();
-    cmd_otcli_init();
-#endif
-
-#if CHIP_SHELL_ENABLE_CMD_SERVER
-    cmd_app_server_init();
-#endif
-
     chip::DeviceLayer::PlatformMgr().ScheduleWork(InitServer);
 
-#if CONFIG_CHIP_LIB_SHELL
-    Engine::Root().RunMainLoop();
-#endif
-
     return 0;
 }