76382 Add sharding options to test command line (cla: yes, tool, waiting for tree to go green)

76400 [flutter_tools] Refactor DeferredComponents validator and add build target (cla: yes, tool, waiting for tree to go green)

76406 Do not show embedding warning for plugins when example app is missing (cla: yes, platform-android, tool, waiting for tree to go green)

76414 Skip assemble version check in tool backend scripts (cla: yes, tool)

76416 [flutter_tools] remove globals and mocks from android gradle builder and test (cla: yes, tool)

76420 Update all packages and upgrade to path_provider 2.0.0-nullsafety (cla: yes, team, tool)

76436 Remove unused imports of system libraries. (cla: yes, tool, waiting for tree to go green)