75022 Migrate driver tests in example/ to NNBD (cla: yes, d: examples, team, waiting for tree to go green)

75023 Migrate some benchmarks to NNBD (cla: yes, team, waiting for tree to go green)

75026 Bump flutter_gallery_assets (cla: yes, team, tool, waiting for tree to go green)

75029 Migrate off e2e (cla: yes, team, tool, waiting for tree to go green)

75030 Revert “NNBD integration_test” (a: tests, cla: yes, framework, team)

75033 Split tools_tests subshards into separate shards to support sub-sub-sharding (cla: yes, team, waiting for tree to go green)

75037 [web] benchmark and optimize defaultTargetPlatform (cla: yes, framework, team)