Change iOS plugin simulator archs from allow list to deny list (#64504)

dev/devicelab/bin/tasks/plugin_lint_mac.dart

@@ -45,6 +45,7 @@ Future<void> main() async {
             'lint',
             objcPodspecPath,
             '--allow-warnings',
+            '--verbose',
           ],
           environment: <String, String>{
             'LANG': 'en_US.UTF-8',
@@ -63,6 +64,7 @@ Future<void> main() async {
             objcPodspecPath,
             '--allow-warnings',
             '--use-libraries',
+            '--verbose',
           ],
           environment: <String, String>{
             'LANG': 'en_US.UTF-8',

packages/flutter_tools/templates/plugin/ios-objc.tmpl/projectName.podspec.tmpl

@@ -18,6 +18,6 @@ Pod::Spec.new do |s|
   s.dependency 'Flutter'
   s.platform = :ios, '8.0'
 
-  # Flutter.framework does not contain a i386 slice. Only x86_64 simulators are supported.
-  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
 end

packages/flutter_tools/templates/plugin/ios-swift.tmpl/projectName.podspec.tmpl

@@ -17,7 +17,7 @@ Pod::Spec.new do |s|
   s.dependency 'Flutter'
   s.platform = :ios, '8.0'
 
-  # Flutter.framework does not contain a i386 slice. Only x86_64 simulators are supported.
-  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
   s.swift_version = '5.0'
 end