feat: start `telemetry` app before `emqx`

mix.exs

@@ -208,6 +208,7 @@ defmodule EMQXUmbrella.MixProject do
       redbug: :permanent,
       xmerl: :permanent,
       hocon: :load,
+      telemetry: :permanent,
       emqx: :load,
       emqx_conf: :load,
       emqx_machine: :permanent

rebar.config.erl

@@ -360,6 +360,7 @@ relx_apps(ReleaseType, Edition) ->
         redbug,
         xmerl,
         {hocon, load},
+        telemetry,
         % started by emqx_machine
         {emqx, load},
         {emqx_conf, load},