45940 Deprecate UpdateLiveRegionEvent (a: accessibility, cla: yes, framework, severe: API break, waiting for tree to go green)

45941 Re-land “Add option to delay rendering the first frame (#45135)” (a: tests, cla: yes, framework, severe: API break, waiting for tree to go green)

45942 RenderProxySliver (cla: yes, f: scrolling, framework, severe: new feature, team, waiting for tree to go green)

45943 Fix null event crash in TapGestureRecognizer (cla: yes, framework, waiting for tree to go green)

45944 Update PULL_REQUEST_TEMPLATE.md (cla: yes)

45945 Simplify logging code in flutter_driver (a: tests, cla: yes, framework, tool)