Fix wlan check failure on macos (#42770)

### What does this PR do?
This PR provides a solution to WiFi check failure on MacOS

### Motivation
WINA-2015: Wifi-Check does not work on the latest version on the Mac

### Describe how you validated your changes
Ensure command "agent check wlan" works correctly and all CI pipelines pass. More details can be found in JIRA case [WINA-2015](https://datadoghq.atlassian.net/browse/WINA-2015).

### Additional Notes


[WINA-2015]: https://datadoghq.atlassian.net/browse/WINA-2015?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Co-authored-by: hongshi.guo <hongshi.guo@datadoghq.com>

Author: guohdd

cmd/agent/install_mac_os.sh

@@ -0,0 +1,67 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2016-present Datadog, Inc.
+
+import Foundation
+import os.log
+
+enum LogLevel {
+    case debug, info, error
+}
+
+class Logger {
+    private static var useFileLogging = false
+    private static let osLog = OSLog(subsystem: "com.datadoghq.agent", category: "GUI")
+
+    /// Configure logging mode at startup
+    /// - Parameter useFileLogging: If true, uses NSLog (file-based); if false, uses os_log (unified logging)
+    static func configure(useFileLogging: Bool) {
+        self.useFileLogging = useFileLogging
+        if useFileLogging {
+            NSLog("[Logger] File-based logging enabled")
+        } else {
+            os_log("[Logger] Unified logging (os_log) enabled", log: osLog, type: .info)
+        }
+    }
+
+    /// Log a message with specified level and context
+    /// - Parameters:
+    ///   - message: The message to log
+    ///   - level: Log level (debug, info, error)
+    ///   - context: Optional context string (e.g., class name)
+    static func log(_ message: String, level: LogLevel = .info, context: String = "") {
+        let prefix = context.isEmpty ? "" : "[\(context)] "
+        let fullMessage = "\(prefix)\(message)"
+
+        if useFileLogging {
+            // Use NSLog which outputs to stdout/stderr (redirected to file by LaunchAgent)
+            NSLog(fullMessage)
+        } else {
+            // Use os_log (default) - automatic log size management by macOS
+            switch level {
+            case .debug:
+                os_log("%{public}@", log: osLog, type: .debug, fullMessage)
+            case .info:
+                os_log("%{public}@", log: osLog, type: .info, fullMessage)
+            case .error:
+                os_log("%{public}@", log: osLog, type: .error, fullMessage)
+            }
+        }
+    }
+
+    /// Log a debug message
+    static func debug(_ message: String, context: String = "") {
+        log(message, level: .debug, context: context)
+    }
+
+    /// Log an info message
+    static func info(_ message: String, context: String = "") {
+        log(message, level: .info, context: context)
+    }
+
+    /// Log an error message
+    static func error(_ message: String, context: String = "") {
+        log(message, level: .error, context: context)
+    }
+}