74383 Remove “unnecessary” imports in dev/integration_tests (a: accessibility, cla: yes, f: material design, team, waiting for tree to go green)

d: examples - 43 pull request(s)

64240 Add sample code to FadeTransition (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

64638 Add sample code to DefaultTextStyleTransition (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

64698 Added sample code to AnimatedAlign (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

64766 Updated README.md file of the hello_world example (cla: yes, d: examples, team, waiting for tree to go green)