Suppress stderr during Xcode command line installation check (#163785)

Xcode is in some kind of half-installed state (missing a cert? unknown)
on some devicelab Macs https://github.com/flutter/flutter/issues/161655.
As of https://github.com/flutter/flutter/pull/163685 Xcode cipd
installation isn't requested as part of the builder configuration, so it
seems like Xcode is just hanging out on that devicelab bot
quasi-installed, unrelated to the recipe.

In any case, the tool is actually doing the right thing and detecting
that Xcode isn't in a good state and continuing as if it isn't
installed, but is logging a wall of error text about it to stderr, which
that Android test doesn't like. Instead of updating the test to allow
stderr, instead swap the Xcode installation path to `exitsHappySync` to
only check the exit code (or exception), which is the original intention
behind the Xcode command line checks.


e6730613c9/packages/flutter_tools/lib/src/base/process.dart (L596-L601)

Fixes https://github.com/flutter/flutter/issues/161655

## Pre-launch Checklist

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there for submitting PRs.
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responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

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packages/flutter_tools/lib/src/macos/xcode.dart

@@ -172,22 +172,15 @@ class Xcode {
 
   /// Verifies that simctl is installed by trying to run it.
   bool get isSimctlInstalled {
-    if (_isSimctlInstalled == null) {
-      try {
     // This command will error if additional components need to be installed in
     // xcode 9.2 and above.
-        final RunResult result = _processUtils.runSync(<String>[
+    _isSimctlInstalled ??= _processUtils.exitsHappySync(<String>[
       ...xcrunCommand(),
       'simctl',
       'list',
       'devices',
       'booted',
     ]);
-        _isSimctlInstalled = result.exitCode == 0;
-      } on ProcessException {
-        _isSimctlInstalled = false;
-      }
-    }
     return _isSimctlInstalled ?? false;
   }
 
@@ -197,20 +190,15 @@ class Xcode {
   /// to run it. `devicectl` is made available in Xcode 15.
   bool get isDevicectlInstalled {
     if (_isDevicectlInstalled == null) {
-      try {
       if (currentVersion == null || currentVersion!.major < 15) {
         _isDevicectlInstalled = false;
         return _isDevicectlInstalled!;
       }
-        final RunResult result = _processUtils.runSync(<String>[
+      _isDevicectlInstalled = _processUtils.exitsHappySync(<String>[
         ...xcrunCommand(),
         'devicectl',
         '--version',
       ]);
-        _isDevicectlInstalled = result.exitCode == 0;
-      } on ProcessException {
-        _isDevicectlInstalled = false;
-      }
     }
     return _isDevicectlInstalled ?? false;
   }

packages/flutter_tools/test/general.shard/macos/xcode_test.dart

@@ -78,18 +78,45 @@ void main() {
         fakeProcessManager.addCommand(
           const FakeCommand(
             command: <String>['xcrun', 'simctl', 'list', 'devices', 'booted'],
+            stderr: 'failed to run',
             exitCode: 1,
           ),
         );
         final Xcode xcode = Xcode.test(
           processManager: fakeProcessManager,
           xcodeProjectInterpreter: xcodeProjectInterpreter,
+          logger: logger,
         );
 
         expect(xcode.isSimctlInstalled, isFalse);
         expect(fakeProcessManager, hasNoRemainingExpectations);
+        expect(logger.statusText, isEmpty);
+        expect(logger.errorText, isEmpty);
       });
 
+      testWithoutContext(
+        'isSimctlInstalled is false when simctl list throws process exception',
+        () {
+          fakeProcessManager.addCommand(
+            const FakeCommand(
+              command: <String>['xcrun', 'simctl', 'list', 'devices', 'booted'],
+              exception: ProcessException('xcrun', <String>['simctl']),
+            ),
+          );
+          final Xcode xcode = Xcode.test(
+            processManager: fakeProcessManager,
+            xcodeProjectInterpreter: xcodeProjectInterpreter,
+            logger: logger,
+          );
+
+          expect(xcode.isSimctlInstalled, isFalse);
+          expect(fakeProcessManager, hasNoRemainingExpectations);
+          expect(logger.statusText, isEmpty);
+          expect(logger.errorText, isEmpty);
+          expect(logger.traceText, contains('ProcessException'));
+        },
+      );
+
       group('isDevicectlInstalled', () {
         testWithoutContext('is true when Xcode is 15+ and devicectl succeeds', () {
           fakeProcessManager.addCommand(
@@ -113,10 +140,35 @@ void main() {
           final Xcode xcode = Xcode.test(
             processManager: fakeProcessManager,
             xcodeProjectInterpreter: xcodeProjectInterpreter,
+            logger: logger,
           );
 
           expect(xcode.isDevicectlInstalled, isFalse);
           expect(fakeProcessManager, hasNoRemainingExpectations);
+          expect(logger.statusText, isEmpty);
+          expect(logger.errorText, isEmpty);
+        });
+
+        testWithoutContext('is false when devicectl throws process exception', () {
+          fakeProcessManager.addCommand(
+            const FakeCommand(
+              command: <String>['xcrun', 'devicectl', '--version'],
+              exitCode: 1,
+              exception: ProcessException('xcrun', <String>['devicectl']),
+            ),
+          );
+          xcodeProjectInterpreter.version = Version(15, 0, 0);
+          final Xcode xcode = Xcode.test(
+            processManager: fakeProcessManager,
+            xcodeProjectInterpreter: xcodeProjectInterpreter,
+            logger: logger,
+          );
+
+          expect(xcode.isDevicectlInstalled, isFalse);
+          expect(fakeProcessManager, hasNoRemainingExpectations);
+          expect(logger.statusText, isEmpty);
+          expect(logger.errorText, isEmpty);
+          expect(logger.traceText, contains('ProcessException'));
         });
 
         testWithoutContext('is false when Xcode is less than 15', () {