57287 remove pending timers list code out of assert message (a: tests, cla: yes, framework)

57696 Functionality to check handlers set on platform channels (a: tests, cla: yes, framework, waiting for tree to go green)

58210 [e2e] make test bindings friendlier to integration tests (a: tests, cla: yes, framework)

58430 [flutter_driver] make timeline request in chunks (a: tests, cla: yes, framework, perf: memory)

58514 add rasterizer start times to timeline summaries (a: tests, cla: yes, framework, waiting for tree to go green)

58620 Make debugSemantics available to profile mode (a: accessibility, a: tests, cla: yes, framework, team)