[beta] Dart MCP server updates

Issue description: Without this change, the dart MCP command launch_app will not work for the `chrome` device target because it won't find any DTD URI.

What is the fix: This starts using the `--machine` along with `--print-dtd` arguments to the `flutter run` command, now that it prints the DTD URI in machine mode.

Why cherry-pick: This will enable Flutter developers to develop web apps using the MCP server without hanging.

Risk: Low, this only affects the Dart MCP server's `launch_app` command so the radius is small, and the likely worst thing that could happen is that it would stop working for other devices as well.

See dart-lang/ai#301 and flutter/flutter#176655 for more information.

Cherry-pick: https://dart-review.googlesource.com/c/sdk/+/456480
Bug: dart-lang/ai#302
Change-Id: Ide1ea8d447de43a0a48fae05d40f9051457eaa2c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/456482
Commit-Queue: Alexander Thomas <[email protected]>
Reviewed-by: Ivan Inozemtsev <[email protected]>
Reviewed-by: Alexander Thomas <[email protected]>

Author: gspencergoog

CHANGELOG.md

@@ -123,6 +123,24 @@ instead.
   Dart SDK for ia32 anymore (support to execute the `dartvm` for ia32
   architecture is retained).
 
+#### Dart MCP Server
+
+- The Dart MCP server now has additional tools:
+
+  This release introduces a suite of new tools for interacting with Flutter
+  applications, including support for flutter_driver commands like screenshot,
+  as well as tools for `list_devices`, `launch_app`, `get_app_logs`,
+  `list_running_apps` and performing a `hot_restart`. The `pub` MCP tool has
+  been enhanced with support for the `pub outdated` command, and both `pub add`
+  and `pub remove` now accept multiple packages.
+
+- And some bug fixes:
+
+  Key fixes include providing the full widget tree instead of a summary for
+  better widget discovery and improved error reporting for tools that handle
+  multiple paths. Additionally, this version adds more detailed logging for failed
+  app launches and fixes a bug in hot_reload.
+
 ### Libraries
 
 #### `dart:async`

DEPS

@@ -131,7 +131,7 @@ vars = {
   ### /third_party/pkg dependencies
   # 'tools/rev_sdk_deps.dart' will rev pkg dependencies to their latest; put an
   # EOL comment after a dependency to instead pin at the current revision.
-  "ai_rev": "59db320ee39a1ae5f6e2830be851e52bb7263ce1",
+  "ai_rev": "0a85ddf4f75cee6e3abe07cecdffae69bbdbc793",
   "core_rev": "5c3e2c38df268be2347f3aad30ced0147dd012bb", # b/444274553
   "dartdoc_rev": "ec2a4feee51961e9fbdd2bd94060cc8fc994c47e",
   "ecosystem_rev": "96ee86147a5f4c70aed64262e1521b745936cdb1",