License update - Batch 14

[mossmana]

Updates the license headers for:

1. packages/devtools_app/lib/src/screens/app_size/app_size_controller.dart
2. packages/devtools_app/lib/src/screens/app_size/app_size_screen.dart
3. packages/devtools_app/lib/src/screens/app_size/app_size_table.dart
4. packages/devtools_app/lib/src/screens/app_size/code_size_attribution.dart
5. packages/devtools_app/test/screens/app_size/app_size_screen_test.dart
6. packages/devtools_app/test/screens/app_size/code_size_attribution_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.