Dart 3.9 / Flutter 3.35 [first LLM release] (#2714)

I got carried away with Gemini and basically rewrote CI and the release
process for the new LLM reality. This work was largely completed by
Gemini.

- Bump all SDK versions to the current beta (3.9.0-0)
- Run `flutter channel beta`
- Wrote `ci_script.dart` to replace the bash scripts
- Converted repository to pub workspace #2499 
- Added llm.md and release.md
- Added redirect for deprecated Samples Index

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).

isolate_example/lib/data_transfer_page.dart

@@ -74,7 +74,9 @@ class DataTransferPage extends StatelessWidget {
                   },
                 ),
                 onPressed: () => controller.generateRandomNumbers(true),
-                child: const Text('Transfer Data with TransferableTypedData'),
+                child: const Text(
+                  'Transfer Data with TransferableTypedData',
+                ),
               ),
               ElevatedButton(
                 style: ElevatedButton.styleFrom(
@@ -207,8 +209,9 @@ class RunningList extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final progress =
-        Provider.of<DataTransferIsolateController>(context).currentProgress;
+    final progress = Provider.of<DataTransferIsolateController>(
+      context,
+    ).currentProgress;
 
     return DecoratedBox(
       decoration: BoxDecoration(color: Colors.grey[200]),

isolate_example/lib/infinite_process_page.dart

@@ -35,7 +35,9 @@ class InfiniteProcessPage extends StatelessWidget {
 
   @override
   Widget build(context) {
-    final controller = Provider.of<InfiniteProcessIsolateController>(context);
+    final controller = Provider.of<InfiniteProcessIsolateController>(
+      context,
+    );
 
     return SafeArea(
       child: Column(
@@ -196,7 +198,9 @@ class RunningList extends StatelessWidget {
 
   @override
   Widget build(context) {
-    final controller = Provider.of<InfiniteProcessIsolateController>(context);
+    final controller = Provider.of<InfiniteProcessIsolateController>(
+      context,
+    );
 
     var sums = controller.currentResults;
 
@@ -208,10 +212,9 @@ class RunningList extends StatelessWidget {
           return Column(
             children: [
               Card(
-                color:
-                    (controller.created && !controller.paused)
-                        ? Colors.lightGreenAccent
-                        : Colors.deepOrangeAccent,
+                color: (controller.created && !controller.paused)
+                    ? Colors.lightGreenAccent
+                    : Colors.deepOrangeAccent,
                 child: ListTile(
                   leading: Text('${sums.length - index}.'),
                   title: Text('${sums[index]}.'),

isolate_example/lib/main.dart

@@ -31,7 +31,8 @@ const double windowWidth = 1024;
 const double windowHeight = 800;
 
 void setupWindow() {
-  if (!kIsWeb && (Platform.isWindows || Platform.isLinux || Platform.isMacOS)) {
+  if (!kIsWeb &&
+      (Platform.isWindows || Platform.isLinux || Platform.isMacOS)) {
     WidgetsFlutterBinding.ensureInitialized();
     setWindowTitle('Isolate Example');
     setWindowMinSize(const Size(windowWidth, windowHeight));

isolate_example/lib/performance_page.dart

@@ -57,8 +57,9 @@ class _PerformancePageState extends State<PerformancePage> {
                     return ElevatedButton(
                       style: ElevatedButton.styleFrom(elevation: 8.0),
                       onPressed: switch (snapshot.connectionState) {
-                        ConnectionState.done =>
-                          () => handleComputeOnMain(context),
+                        ConnectionState.done => () => handleComputeOnMain(
+                          context,
+                        ),
                         _ => null,
                       },
                       child: const Text('Compute on Main'),
@@ -71,8 +72,9 @@ class _PerformancePageState extends State<PerformancePage> {
                     return ElevatedButton(
                       style: ElevatedButton.styleFrom(elevation: 8.0),
                       onPressed: switch (snapshot.connectionState) {
-                        ConnectionState.done =>
-                          () => handleComputeOnSecondary(context),
+                        ConnectionState.done => () => handleComputeOnSecondary(
+                          context,
+                        ),
                         _ => null,
                       },
                       child: const Text('Compute on Secondary'),
@@ -88,12 +90,12 @@ class _PerformancePageState extends State<PerformancePage> {
   }
 
   void handleComputeOnMain(BuildContext context) {
-    var future =
-        computeOnMainIsolate()..then((_) {
-          var snackBar = const SnackBar(content: Text('Main Isolate Done!'));
-          if (!context.mounted) return;
-          ScaffoldMessenger.of(context).showSnackBar(snackBar);
-        });
+    var future = computeOnMainIsolate()
+      ..then((_) {
+        var snackBar = const SnackBar(content: Text('Main Isolate Done!'));
+        if (!context.mounted) return;
+        ScaffoldMessenger.of(context).showSnackBar(snackBar);
+      });
 
     setState(() {
       computeFuture = future;
@@ -101,14 +103,14 @@ class _PerformancePageState extends State<PerformancePage> {
   }
 
   void handleComputeOnSecondary(BuildContext context) {
-    var future =
-        computeOnSecondaryIsolate()..then((_) {
-          var snackBar = const SnackBar(
-            content: Text('Secondary Isolate Done!'),
-          );
-          if (!context.mounted) return;
-          ScaffoldMessenger.of(context).showSnackBar(snackBar);
-        });
+    var future = computeOnSecondaryIsolate()
+      ..then((_) {
+        var snackBar = const SnackBar(
+          content: Text('Secondary Isolate Done!'),
+        );
+        if (!context.mounted) return;
+        ScaffoldMessenger.of(context).showSnackBar(snackBar);
+      });
 
     setState(() {
       computeFuture = future;