70487 Ignore text selection boxes when assembling semantics for placeholder runs (cla: yes, framework, waiting for tree to go green)

70490 Roll Engine from bbcf19ad143c to 63a6fe3cf9ef (3 revisions) (cla: yes, waiting for tree to go green)

70491 Remove some unnecessary casts, now that changes have rolled from the engine (a: internationalization, a: tests, cla: yes, framework, waiting for tree to go green)

70494 Roll Engine from 63a6fe3cf9ef to e06f10638598 (3 revisions) (cla: yes, waiting for tree to go green)

70495 [flutter_releases] Flutter 1.24.0-10.1.pre framework cherrypicks (cla: yes, engine, tool)