Fixed a bug with React Native plugins loading

Summary:
Fixed bug with "Hermes Debugger" and "React Dev Tools" plugin loading reported on GitHub: https://github.com/facebook/flipper/issues/2545.

Changelog: Fixed bug with React Native plugins not loaded: Hermes Debugger, React Dev Tools etc.

Reviewed By: mweststrate

Differential Revision: D29516394

fbshipit-source-id: 4620e3d2b49ca2a1d3a5b2dd76d40d4667a0980b

desktop/app/src/selectors/connections.tsx

@@ -36,9 +36,9 @@ export const getActiveClient = createSelector(
 
 export const getMetroDevice = createSelector(getDevices, (devices) => {
   return (
-    (devices.find(
-      (device) => device.os === 'Metro' && !device.isArchived,
-    ) as MetroDevice) ?? null
+    (devices.find((device) => device.os === 'Metro' && !device.isArchived) as
+      | MetroDevice
+      | undefined) ?? null
   );
 });
 

desktop/app/src/utils/pluginUtils.tsx

@@ -370,6 +370,7 @@ function getFavoritePlugins(
 export function computeActivePluginList({
   enabledPlugins,
   devicePlugins,
+  metroPlugins,
   disabledPlugins,
   downloadablePlugins,
   unavailablePlugins,
@@ -389,6 +390,13 @@ export function computeActivePluginList({
       definition: plugin,
     };
   }
+  for (const plugin of metroPlugins) {
+    pluginList[plugin.id] = {
+      status: 'enabled',
+      details: plugin.details,
+      definition: plugin,
+    };
+  }
   for (const plugin of disabledPlugins) {
     pluginList[plugin.id] = {
       status: 'disabled',