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 `///`).

google_maps/lib/main.dart

@@ -47,7 +47,10 @@ class _MyAppState extends State<MyApp> {
         ),
         body: GoogleMap(
           onMapCreated: _onMapCreated,
-          initialCameraPosition: CameraPosition(target: _center, zoom: 11.0),
+          initialCameraPosition: CameraPosition(
+            target: _center,
+            zoom: 11.0,
+          ),
           markers: {
             const Marker(
               markerId: MarkerId('Sydney'),

google_maps/lib/src/locations.g.dart

@@ -69,17 +69,16 @@ Map<String, dynamic> _$OfficeToJson(Office instance) => <String, dynamic>{
 };
 
 Locations _$LocationsFromJson(Map<String, dynamic> json) => Locations(
-  offices:
-      (json['offices'] as List<dynamic>)
-          .map((e) => Office.fromJson(e as Map<String, dynamic>))
-          .toList(),
-  regions:
-      (json['regions'] as List<dynamic>)
-          .map((e) => Region.fromJson(e as Map<String, dynamic>))
-          .toList(),
+  offices: (json['offices'] as List<dynamic>)
+      .map((e) => Office.fromJson(e as Map<String, dynamic>))
+      .toList(),
+  regions: (json['regions'] as List<dynamic>)
+      .map((e) => Region.fromJson(e as Map<String, dynamic>))
+      .toList(),
 );
 
-Map<String, dynamic> _$LocationsToJson(Locations instance) => <String, dynamic>{
-  'offices': instance.offices,
-  'regions': instance.regions,
-};
+Map<String, dynamic> _$LocationsToJson(Locations instance) =>
+    <String, dynamic>{
+      'offices': instance.offices,
+      'regions': instance.regions,
+    };