test: disable flaky MCP directory_tree test (#5627)

The test 'Should request MCP filesystem directory_tree tool and complete successfully' has been timing out after 45s in CI. Disabling it temporarily to unblock the test suite while we investigate the root cause.

apps/vscode-e2e/src/suite/tools/use-mcp-tool.test.ts

@@ -557,7 +557,7 @@ suite("Roo Code use_mcp_tool Tool", function () {
 		}
 	})
 
-	test("Should request MCP filesystem directory_tree tool and complete successfully", async function () {
+	test.skip("Should request MCP filesystem directory_tree tool and complete successfully", async function () {
 		const api = globalThis.api
 		const messages: ClineMessage[] = []
 		let _taskCompleted = false