feat(small-video): add flag to hide connection indicators (#3225)

interface_config.js

      */
     CONNECTION_INDICATOR_AUTO_HIDE_TIMEOUT: 5000,
 
+    /**
+     * If true, hides the connection indicators completely.
+     *
+     * @type {boolean}
+     */
+    CONNECTION_INDICATOR_DISABLED: false,
+
     /**
      * The name of the application connected to the "Add people" search service.
      */

modules/UI/videolayout/SmallVideo.js

      * @private
      * @type {boolean}
      */
-    this._showConnectionIndicator = true;
+    this._showConnectionIndicator
+        = !interfaceConfig.CONNECTION_INDICATOR_DISABLED;
 
     /**
      * Whether or not the dominant speaker indicator should be displayed.