73962 [flutter_tools] open chrome to correct base URL when base url is specified in index.html (cla: yes, tool, waiting for tree to go green)

73985 [flutter_releases] Flutter 1.25.0-8.3.pre framework cherrypicks (cla: yes, engine, f: cupertino, framework, team, tool)

74003 Build x86_64 iOS apps with simulator local engines (a: existing-apps, cla: yes, platform-ios, tool)

74055 Skip flaky flutter_immediately_exit test (cla: yes, team: flakes, tool)

74060 Fix pub upgrade to work with new arguments (cla: yes, tool)

74068 Revert integration_test in flutter create template (cla: yes, tool)