macOS: Fix some VPN debug menu commands (#2260)

Task/Issue URL: https://app.asana.com/0/0/1206686508201525/f

## Description

While testing I noticed some useful functionality from our debug menu
(specifically rekeying and triggering the debug notification) was no
longer working.

This should not affect anything other than our debug commands. I'm
enabling them again because it's really useful to be able to force a
rekey form the app.

DuckDuckGo/NetworkProtection/AppTargets/BothAppTargets/NetworkProtectionTunnelController.swift

@@ -287,6 +287,20 @@ final class NetworkProtectionTunnelController: TunnelController, TunnelSessionPr
         }
     }
 
+    // MARK: - Debug Command support
+
+    func relay(_ command: DebugCommand) async throws {
+        guard await isConnected,
+              let session = await session else {
+            return
+        }
+
+        let errorMessage: ExtensionMessageString? = try await session.sendProviderRequest(.debugCommand(command))
+        if let errorMessage {
+            throw TunnelFailureError(errorDescription: errorMessage.value)
+        }
+    }
+
     // MARK: - Tunnel Configuration
 
     /// Setups the tunnel manager if it's not set up already.

DuckDuckGoVPN/TunnelControllerIPCService.swift

@@ -29,14 +29,14 @@ import NetworkProtectionUI
 /// Clients can edit those defaults and this class will observe the changes and relay them to the runnel.
 ///
 final class TunnelControllerIPCService {
-    private let tunnelController: TunnelController
+    private let tunnelController: NetworkProtectionTunnelController
     private let networkExtensionController: NetworkExtensionController
     private let server: NetworkProtectionIPC.TunnelControllerIPCServer
     private let statusReporter: NetworkProtectionStatusReporter
     private var cancellables = Set<AnyCancellable>()
     private let defaults: UserDefaults
 
-    init(tunnelController: TunnelController,
+    init(tunnelController: NetworkProtectionTunnelController,
          networkExtensionController: NetworkExtensionController,
          statusReporter: NetworkProtectionStatusReporter,
          defaults: UserDefaults = .netP) {
@@ -112,6 +112,8 @@ extension TunnelControllerIPCService: IPCServerInterface {
     }
 
     func debugCommand(_ command: DebugCommand) async throws {
+        try await tunnelController.relay(command)
+
         switch command {
         case .removeSystemExtension:
 #if NETP_SYSTEM_EXTENSION