87925 Updated skipped tests for flutter_tools. (team, tool, cla: yes, tech-debt, skip-test)

87930 refactor IosProject and MacOSProject to extends XcodeBasedProject to share common (tool, cla: yes, waiting for tree to go green)

87962 Fix errors in examples (a: tests, tool, framework, f: material design, cla: yes, waiting for tree to go green)

87976 feat: migrate macos/application_package.dart to null-safety (tool, cla: yes, waiting for tree to go green)

87991 Add dartPluginClass support for Android and iOS (tool, cla: yes, waiting for tree to go green)

88015 feat: migrate base/dds.dart to null-safety (tool, cla: yes, waiting for tree to go green)