License update - Batch 37

[mossmana]

Updates the license headers for:

1. packages/devtools_app/lib/src/shared/offline/offline_data.dart
2. packages/devtools_app/lib/src/shared/offline/offline_screen.dart
3. packages/devtools_app/test/shared/offline/review_history_on_disconnect_test.dart
4. packages/devtools_app/lib/src/shared/preferences/_cpu_profiler_preferences.dart
5. packages/devtools_app/lib/src/shared/preferences/_extension_preferences.dart
6. packages/devtools_app/lib/src/shared/preferences/_inspector_preferences.dart
7. packages/devtools_app/lib/src/shared/preferences/_logging_preferences.dart
8. packages/devtools_app/lib/src/shared/preferences/_memory_preferences.dart
9. packages/devtools_app/lib/src/shared/preferences/_network_preferences.dart
10. packages/devtools_app/lib/src/shared/preferences/_performance_preferences.dart
11. packages/devtools_app/lib/src/shared/preferences/preferences.dart
12. packages/devtools_app/test/shared/preferences/preferences_controller_test.dart

#8216

Pre-launch Checklist

• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• I read the [Tree Hygiene] wiki page, which explains my responsibilities.
• I read the [Flutter Style Guide] recently, and have followed its advice.
• I signed the [CLA].
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or there is a reason for not adding tests.