Refactor FXIOS-7301 - Help to remove 1 closure_body_length violation …

…from UITestAppDelegate.swift (1/3) #21333

* Extract webserver port config to a new function

* Use the new function

* Change access modifier

firefox-ios/Client/Application/UITestAppDelegate.swift

@@ -34,12 +34,7 @@ class UITestAppDelegate: AppDelegate, FeatureFlaggable {
 
         launchArguments.forEach { arg in
             if arg.starts(with: LaunchArguments.ServerPort) {
-                let portString = arg.replacingOccurrences(of: LaunchArguments.ServerPort, with: "")
-                if let port = Int(portString) {
-                    AppInfo.webserverPort = port
-                } else {
-                    fatalError("Failed to set web server port override.")
-                }
+                configureWebserverPort(arg)
             }
 
             if arg.starts(with: LaunchArguments.LoadDatabasePrefix) {
@@ -200,6 +195,15 @@ class UITestAppDelegate: AppDelegate, FeatureFlaggable {
         return profile
     }
 
+    private func configureWebserverPort(_ arg: String) {
+        let portString = arg.replacingOccurrences(of: LaunchArguments.ServerPort, with: "")
+        if let port = Int(portString) {
+            AppInfo.webserverPort = port
+        } else {
+            fatalError("Failed to set web server port override.")
+        }
+    }
+
     override func application(
         _ application: UIApplication,
         willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil