62630 Add integration test for plugins without ios directories (a: tests, cla: yes, platform-ios, team, waiting for tree to go green)

62640 promote WidgetTester pumpAndSettle (a: tests, cla: yes, framework, waiting for tree to go green)

62755 Add punctuation for unterminated sentences in doc comments (a: accessibility, a: internationalization, a: tests, cla: yes, d: api docs, documentation, f: cupertino, f: material design, framework, tool)

62809 [null-safety] remove some usages of mockito (a: tests, cla: yes, framework, waiting for tree to go green)

62894 [null-safety] revert export of Fake from test_api (a: tests, framework, waiting for tree to go green)