Do not delete output directory during flutter build ios-framework (#45740)

packages/flutter_tools/lib/src/commands/build_ios_framework.dart

@@ -148,10 +148,6 @@ class BuildIOSFrameworkCommand extends BuildSubCommand {
 
     final Directory outputDirectory = fs.directory(fs.path.normalize(outputArgument));
 
-    if (outputDirectory.existsSync()) {
-      outputDirectory.deleteSync(recursive: true);
-    }
-
     aotBuilder ??= AotBuilder();
     bundleBuilder ??= BundleBuilder();
 
@@ -159,6 +155,10 @@ class BuildIOSFrameworkCommand extends BuildSubCommand {
       printStatus('Building framework for $iosProject in ${getNameForBuildMode(mode)} mode...');
       final String xcodeBuildConfiguration = toTitleCase(getNameForBuildMode(mode));
       final Directory modeDirectory = outputDirectory.childDirectory(xcodeBuildConfiguration);
+
+      if (modeDirectory.existsSync()) {
+        modeDirectory.deleteSync(recursive: true);
+      }
       final Directory iPhoneBuildOutput = modeDirectory.childDirectory('iphoneos');
       final Directory simulatorBuildOutput = modeDirectory.childDirectory('iphonesimulator');