Related to flutter/flutter#183099

Allow users to specify onExit as optional

## Pre-Review Checklist

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Adds some optional behaviors needed to use the tool in flutter/core-packages:
- Allow setting a min Dart version rather than a min Flutter version at the repo level
- Don't require .ci.yaml to be present when batch config isn't used (since that repo currently doesn't use LUCI)

)

Google Maps SDK 8.4 didn't include a privacy manifest, just instructions for clients to download and manually add one. Rather than push that requirement onto plugin clients, we duplicated all of the relevant manifest entries into the plugin's manifest.

[Starting with 9.0.0](flutter/flutter#146838 (comment)) the Google Maps SDK includes its own manifest, so we no longer need to bundle it ourselves when we know that the SDK is 9+. Since that's the case for the SDK-specific copies of the implementation package, we can remove it there, while leaving it in `google_maps_flutter_ios` (which can still resolve to 8.4).

Fixes flutter/flutter#146838

## Pre-Review Checklist

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

flutter/flutter@f3a4b98...c8f2f16

2026-05-27 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[Flutter GPU] Add explicit draw counts (#186639)" (flutter/flutter#187170)
2026-05-27 engine-flutter-autoroll@skia.org Roll Dart SDK from 7dcea971af6b to f3db7b7d9801 (2 revisions) (flutter/flutter#187144)
2026-05-27 bdero@google.com [Flutter GPU] Add explicit draw counts (flutter/flutter#186639)
2026-05-27 engine-flutter-autoroll@skia.org Roll Skia from f9db7748563e to fa944af10f91 (1 revision) (flutter/flutter#187139)
2026-05-27 bdero@google.com [Flutter GPU] Flutter GPU ShaderLibrary in-place reload for shader hot reload (flutter/flutter#186793)
2026-05-27 engine-flutter-autoroll@skia.org Roll Skia from a692cbf38952 to f9db7748563e (8 revisions) (flutter/flutter#187135)
2026-05-27 burak.karahan@mail.ru Use local semantics tester in Material button tests (flutter/flutter#186667)
2026-05-27 rmolivares@renzo-olivares.dev Filter out `a: text input` from `team-framework` PR triage  (flutter/flutter#187129)
2026-05-27 bkonyi@google.com [Engine] Fix silent buffer mismatch bug in FML Win32 CommandLineFromPlatform (flutter/flutter#187120)
2026-05-27 srawlins@google.com examples: Remove unused parameters (flutter/flutter#185819)
2026-05-27 116356835+AbdeMohlbi@users.noreply.github.com Remove another `String.valueOf` (flutter/flutter#186628)
2026-05-27 alex.medinsh@gmail.com Print trace when skipping flavor-specific and platform-specific assets (flutter/flutter#187045)
2026-05-26 adilhanney@disroot.org Fix `InteractiveViewer` memory leak from undisposed `CurvedAnimation`s (flutter/flutter#185826)
2026-05-26 meylis@divine.video Fix AccessibilityBridge startup crash on vendor-modified Android (flutter/flutter#184630)
2026-05-26 keertip@users.noreply.github.com Update data driven fixes docs (flutter/flutter#186217)
2026-05-26 ahmedsameha1@gmail.com Add more 0x0 size tests part10 (flutter/flutter#186201)
2026-05-26 46920873+gabrimatic@users.noreply.github.com Disable spell check for obscured text (flutter/flutter#186329)
2026-05-26 chris@bracken.jp [iOS] Migrate VSyncClient and DisplayLinkManager to Swift (flutter/flutter#187001)
2026-05-26 bkonyi@google.com [flutter_tools, devicelab] Add safety filesystem guard to tests (flutter/flutter#186748)
2026-05-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from Itd2Jq_ZIABH2rW7B... to k9EizfEGJO4WwQN9-... (flutter/flutter#187115)
2026-05-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 00e625453c43 to 7dcea971af6b (1 revision) (flutter/flutter#187117)
2026-05-26 rmacnak@google.com Remove use of deprecated copy_trees. (flutter/flutter#187091)
2026-05-26 15619084+vashworth@users.noreply.github.com Use resolved implementation plugins with SwiftPM (flutter/flutter#187097)
2026-05-26 engine-flutter-autoroll@skia.org Roll Skia from 27a819894f7c to a692cbf38952 (3 revisions) (flutter/flutter#187109)
2026-05-26 engine-flutter-autoroll@skia.org Roll Packages from 69cf959 to fc795e5 (4 revisions) (flutter/flutter#187114)
2026-05-26 mvincentong@gmail.com Handle simctl process exceptions during discovery (flutter/flutter#186501)
2026-05-26 mvincentong@gmail.com Clarify precache enabled platforms help (flutter/flutter#186878)
2026-05-26 bkonyi@google.com [tool] Refactor artifacts.dart to use enhanced enums and reduce duplication (flutter/flutter#187063)
2026-05-26 jason-simmons@users.noreply.github.com Build script updates for syncing engine sources and building artifacts on linux-arm64 (flutter/flutter#186917)

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