70808 Migrate template to Gradle 6.7 and AGP 4.1.0 (a: accessibility, cla: yes, d: examples, team, tool)

70977 [flutter_tools] Remove usage of –precompiled flag for web tests (a: accessibility, cla: yes, f: cupertino, f: material design, framework, team, tool)

71096 Revert “Migrate template to Gradle 6.7 and AGP 4.1.0” (a: accessibility, cla: yes, d: examples, team, tool)

71446 Relands: Migrate template to Gradle 6.7 and AGP 4.1.0 (a: accessibility, cla: yes, d: examples, team, tool)

72169 Migrate the first batch of API samples to null safety (a: accessibility, cla: yes, framework, team, waiting for tree to go green)