test: Exclude flame_3d from the flutter/tests customer_testing run

scripts/customer_testing.dart

@@ -6,31 +6,47 @@
 
 import 'dart:io';
 
-Future<void> main() async {
-  await _run('flutter', ['analyze', '--no-fatal-infos']);
-
-  // Golden and rendering tests are platform-sensitive, so the full per-package
-  // test suites only run on Linux, where the golden files are generated.
-  if (!Platform.isLinux) {
-    return;
-  }
+// flame_3d builds on the experimental flutter_gpu library, whose API changes
+// frequently in flutter/flutter's presubmit. Analyzing it here would block
+// framework changes on an unstable dependency that is not representative of
+// Flame, so it is excluded from this run.
+const _excludedPackages = {'flame_3d'};
 
+Future<void> main() async {
   final packages =
       Directory('packages')
           .listSync()
           .whereType<Directory>()
           .where(
-            (directory) => Directory('${directory.path}/test').existsSync(),
+            (directory) => !_excludedPackages.contains(_packageName(directory)),
           )
           .toList()
         ..sort((a, b) => a.path.compareTo(b.path));
 
-  for (final package in packages) {
+  await _run('flutter', [
+    'analyze',
+    '--no-fatal-infos',
+    'doc',
+    ...packages.map((directory) => directory.path),
+  ]);
+
+  // Golden and rendering tests are platform-sensitive, so the full per-package
+  // test suites only run on Linux, where the golden files are generated.
+  if (!Platform.isLinux) {
+    return;
+  }
+
+  for (final package in packages.where(
+    (directory) => Directory('${directory.path}/test').existsSync(),
+  )) {
     stdout.writeln('Running tests in ${package.path}');
     await _run('flutter', ['test'], workingDirectory: package.path);
   }
 }
 
+String _packageName(Directory directory) =>
+    directory.path.split(Platform.pathSeparator).last;
+
 Future<void> _run(
   String executable,
   List<String> arguments, {