See #110016 for context:

• convert fuchsia_ctl to null safety: Delete fuchsia_ctl package packages#2528
• convert packages/imitation_game/imitation_tests/smiley/flutter/smiley to null safety: Migrate imitation_game and pigeon to null safety packages#2526
• convert packages/pigeon/platform_tests/android_unit_tests, .../ios_swift_unit_tests, and .../ios_unit_tests to null safety: Migrate imitation_game and pigeon to null safety packages#2526
• convert imitation_game to null safety: [imitation_game] Migrate imitation game to null safety packages#2483
• convert web_benchmarks to null safety: Migrate package [web_benchmarks] to null safety  #98647