52906 [flutter_tools] split start app android tests into new file (cla: yes, tool)

52910 Roll engine 373ebe6430b2..06c8a2909e42 (5 commits) (cla: yes, waiting for tree to go green)

52911 [flutter_tools] split isSupportedForProject test into new file (cla: yes, tool)

52913 Fix ios black screen during splash screen if widget binding initializ… (cla: yes, framework, waiting for tree to go green)

52916 Refactor exits happy (cla: yes, tool, work in progress; do not review)

52917 Roll engine 06c8a2909e42..046a4a6c2bc3 (1 commits) (cla: yes, waiting for tree to go green)