61918 Test dynamic surface switch (cla: yes, team, waiting for tree to go green)

61921 Remove the flaky flag for frame policy test  (cla: yes, team, waiting for tree to go green)

61940 Check if a double is NaN before converting to it int (cla: yes, framework, waiting for tree to go green)

61941 migrate physics to nullsafety (cla: yes, framework, team, waiting for tree to go green)

61948 Add LayoutBuilder example (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

61961 Improve message error for missing textBaseline (a: error message, cla: yes, framework, waiting for tree to go green)