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 `///`).

place_tracker/lib/place_map.dart

@@ -278,8 +278,9 @@ class _PlaceMapState extends State<PlaceMap> {
         // At this point, we know the places have been updated from the list
         // view. We need to reconfigure the map to respect the updates.
         for (final place in newConfiguration.places) {
-          final oldPlace =
-              _configuration!.places.where((p) => p.id == place.id).firstOrNull;
+          final oldPlace = _configuration!.places
+              .where((p) => p.id == place.id)
+              .firstOrNull;
           if (oldPlace == null || oldPlace != place) {
             // New place or updated place.
             _updateExistingPlaceMarker(place: place);
@@ -355,8 +356,9 @@ class _PlaceMapState extends State<PlaceMap> {
       final updatedMarker = marker.copyWith(
         infoWindowParam: InfoWindow(
           title: place.name,
-          snippet:
-              place.starRating != 0 ? '${place.starRating} Star Rating' : null,
+          snippet: place.starRating != 0
+              ? '${place.starRating} Star Rating'
+              : null,
         ),
       );
       _updateMarker(marker: marker, updatedMarker: updatedMarker, place: place);
@@ -502,8 +504,8 @@ class _CategoryButtonBar extends StatelessWidget {
                 style: FilledButton.styleFrom(
                   backgroundColor:
                       selectedPlaceCategory == PlaceCategory.favorite
-                          ? Colors.green[700]
-                          : Colors.lightGreen,
+                      ? Colors.green[700]
+                      : Colors.lightGreen,
                 ),
                 onPressed: () => onChanged(PlaceCategory.favorite),
                 child: const Text(
@@ -515,8 +517,8 @@ class _CategoryButtonBar extends StatelessWidget {
                 style: FilledButton.styleFrom(
                   backgroundColor:
                       selectedPlaceCategory == PlaceCategory.visited
-                          ? Colors.green[700]
-                          : Colors.lightGreen,
+                      ? Colors.green[700]
+                      : Colors.lightGreen,
                 ),
                 onPressed: () => onChanged(PlaceCategory.visited),
                 child: const Text(
@@ -528,8 +530,8 @@ class _CategoryButtonBar extends StatelessWidget {
                 style: FilledButton.styleFrom(
                   backgroundColor:
                       selectedPlaceCategory == PlaceCategory.wantToGo
-                          ? Colors.green[700]
-                          : Colors.lightGreen,
+                      ? Colors.green[700]
+                      : Colors.lightGreen,
                 ),
                 onPressed: () => onChanged(PlaceCategory.wantToGo),
                 child: const Text(