62502 Fix typo subetting should be subsetting (a: error message, cla: yes, tool, waiting for tree to go green)

62616 Migrate foundation test to nullsafety (a: accessibility, a: null-safety, cla: yes, framework)

62694 Convert services tests to NNBD (cla: yes, framework, team)

62701 Migrate gestures, physics and scheduler tests to null safety. (a: null-safety, cla: yes, framework)

62927 AutocompleteCore (a: text input, cla: yes, framework, severe: new feature)

63272 Remove back button when using end drawer (cla: yes, f: material design, framework, waiting for tree to go green)