MM-31391: Add max connection idle timeout to config (#16792)

* Update config.go

* Update telemetry.go

* Update store and store test

* Update settings.go

* use new error code

* Trigger CI

Co-authored-by: Haardik Dharma <dharmahaardik08@gmail.com>

i18n/en.json

@@ -7466,6 +7466,10 @@
     "id": "model.config.is_valid.sitename_length.app_error",
     "translation": "Site name must be less than or equal to {{.MaxLength}} characters."
   },
+  {
+    "id": "model.config.is_valid.sql_conn_max_idle_time_milliseconds.app_error",
+    "translation": "Invalid connection maximum idle time for SQL settings. Must be a non-negative number."
+  },
   {
     "id": "model.config.is_valid.sql_conn_max_lifetime_milliseconds.app_error",
     "translation": "Invalid connection maximum lifetime for SQL settings. Must be a non-negative number."