Remove personal dev team from ios code sigining (#9631)

* Mark channels_integration_test_ios flaky

* Removed personal dev team from ios code siging

* Removed provisioning profile diffs against other samples

dev/devicelab/manifest.yaml

@@ -165,6 +165,7 @@ tasks:
       Checks that platform channels work on iOS.
     stage: devicelab_ios
     required_agent_capabilities: ["has-ios-device"]
+    flaky: true
 
   platform_channel_sample_test_ios:
     description: >

dev/integration_tests/channels/ios/Runner.xcodeproj/project.pbxproj

@@ -183,7 +183,6 @@
 				TargetAttributes = {
 					97C146ED1CF9000F007C117D = {
 						CreatedOnToolsVersion = 7.3.1;
-						DevelopmentTeam = AQ7UHDBEXJ;
 						ProvisioningStyle = Automatic;
 					};
 				};
@@ -426,11 +425,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
 			buildSettings = {
-				ARCHS = arm64;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				CODE_SIGN_IDENTITY = "iPhone Developer";
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
-				DEVELOPMENT_TEAM = AQ7UHDBEXJ;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
@@ -444,9 +439,6 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.channels;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				PROVISIONING_PROFILE = "";
-				PROVISIONING_PROFILE_SPECIFIER = "";
-				ProvisioningStyle = Automatic;
 			};
 			name = Debug;
 		};
@@ -454,11 +446,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
 			buildSettings = {
-				ARCHS = arm64;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
-				CODE_SIGN_IDENTITY = "iPhone Developer";
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
-				DEVELOPMENT_TEAM = AQ7UHDBEXJ;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
 					"$(inherited)",
@@ -472,9 +460,6 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.channels;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				PROVISIONING_PROFILE = "";
-				PROVISIONING_PROFILE_SPECIFIER = "";
-				ProvisioningStyle = Automatic;
 			};
 			name = Release;
 		};