Minor improvements in handling offline applications

Summary:
Some minor loose ends from exploratory testing:

- disconnect device logs event listeners if the device disconnects
- show metro if that is still up, even if the app is no longer connected
- hide the options in the support form to record videos / screenshots if the device isn't connected

Reviewed By: nikoant

Differential Revision: D26277100

fbshipit-source-id: 49d0c934d587b226bc25524224efce60b53939e9

desktop/app/src/devices/BaseDevice.tsx

@@ -225,6 +225,7 @@ export default class BaseDevice {
   }
 
   disconnect() {
+    this.logListeners.clear();
     this.connected.set(false);
   }
 

desktop/app/src/sandy-chrome/appinspect/PluginList.tsx

@@ -86,6 +86,8 @@ export const PluginList = memo(function PluginList({
     pluginsChanged,
   ]);
   const isConnected = useValue(activeDevice?.connected, false);
+  const metroConnected = useValue(metroDevice?.connected, false);
+  const isArchived = activeDevice?.isArchived;
 
   const annotatedDownloadablePlugins = useMemoize<
     [
@@ -198,7 +200,7 @@ export const PluginList = memo(function PluginList({
             ))}
           </PluginGroup>
 
-          {isConnected && (
+          {!isArchived && metroConnected && (
             <PluginGroup
               key="metro"
               title="React Native"