36240 Rearrange flutter assemble implementation (cla: yes, tool)

36243 Allow semantics labels to be shorter or longer than raw text (a: accessibility, cla: yes, customer: money (g3), framework, waiting for tree to go green)

36262 Prevents infinite loop in Table._computeColumnWidths (cla: yes, framework)

36270 Change Future.done to Future.whenComplete (a: tests, cla: yes, framework, team, waiting for tree to go green)

36288 Throw exception if instantiating IOSDevice on non-mac os platform (cla: yes, tool)

36289 FakeHttpClientResponse improvements (cla: yes, tool)

36293 Revert “Keep LLDB connection to iOS device alive while running from CLI. “ (cla: yes, tool)