Fix Flipper lints #10

Summary:
Grey -> gray. "Cancelled" seems quite common in APIs though, so I disabled that.
A few promise cleanups

Reviewed By: aigoncharov

Differential Revision: D31323610

fbshipit-source-id: c8863d995936f451c24eb408fe5c26677187f089

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

@@ -389,6 +389,7 @@ function createBasePluginResult(
     deactivate: () => pluginInstance.deactivate(),
     exportStateAsync: () =>
       pluginInstance.exportState(createStubIdler(), () => {}),
+    // eslint-disable-next-line node/no-sync
     exportState: () => pluginInstance.exportStateSync(),
     triggerDeepLink: async (deepLink: unknown) => {
       pluginInstance.triggerDeepLink(deepLink);