Add logging and fallback for failing vpnless requests

Summary:
If a requests fails due to lack of allow-listing or other incompatibilities, we will now fall back to VPN mode while logging an error that will hopefully end up at the plugin owner.

For this, there's a new `vpnMode` option on every request that can also be used to enforce a particular type.

There's a lot of verbose logging that's turned off by default but very handy when debugging. Also potentially useful for plugin authors that are looking into request issues.

Reviewed By: lblasa

Differential Revision: D49023365

fbshipit-source-id: 755393063e379587feda9ae13973877780a1d987

desktop/flipper-common/src/server-types.tsx

@@ -361,6 +361,7 @@ export type FlipperServerCommands = {
       timeout?: number;
       internGraphUrl?: string;
       headers?: Record<string, string | number | boolean>;
+      vpnMode?: 'vpn' | 'vpnless';
     },
   ) => Promise<GraphResponse>;
   'intern-graph-get': (