fix: add getMcpHub mock to Subtask Rate Limiting tests

The addition of defaultToolProtocol: "native" to model definitions now
triggers the buildNativeToolsArray code path which requires
provider.getMcpHub() to be defined. Added the missing mock method.

src/core/task/__tests__/Task.spec.ts

@@ -981,6 +981,7 @@ describe("Cline", () => {
 					getState: vi.fn().mockResolvedValue({
 						apiConfiguration: mockApiConfig,
 					}),
+					getMcpHub: vi.fn().mockReturnValue(undefined),
 					say: vi.fn(),
 					postStateToWebview: vi.fn().mockResolvedValue(undefined),
 					postMessageToWebview: vi.fn().mockResolvedValue(undefined),