Make sure disconnected devices / apps can be imported and exported

Summary:
It should be possible to exported disconnected devices, so that flipper traces / support form reports can be created from them. This diff introduces this functionality. Support for plugins with custom export logic is introduced in a later diff.

Issues fixed in this diff:
- don't try to take a screenshot for a disconnected device (this would hang forever)
- device plugins were always exported, regardless whether the user did select them or not
- sandy plugins were never part of exported disconnected clients
- increased the amount of data exported for device logs to ~10 MB. This makes more sense now as the logs will no longer be included in all cases
- fixed issue where are plugins would appear to be enabled after the client disconnected (this bug is the result of some unfortunate naming of `isArchived` vs `isConnected` semantics. Will clean up those names in a later diff.

Changelog: It is now possible to create a Flipper trace for disconnected devices and apps

Reviewed By: nikoant

Differential Revision: D26250894

fbshipit-source-id: 4dd0ec0cb152b1a8f649c31913e80efc25bcc5dd

desktop/flipper-plugin/src/test-utils/test-utils.tsx

@@ -208,7 +208,7 @@ export function startPlugin<Module extends FlipperPluginModule<any>>(
     isBackgroundPlugin(_pluginId: string) {
       return !!options?.isBackgroundPlugin;
     },
-    connected: createState(false),
+    connected: createState(true),
     initPlugin() {
       this.connected.set(true);
       pluginInstance.connect();