The integration_test package has various deprecations, but it's troublesome to follow through with the deprecations and remove things when no dart fix is available to guide users through the migration.

Add dart fix capabilities to integration_test following the flutter example found in the packages/flutter/lib/fix_data folder.

Fixes

• A new "fix_data" folder will be added under the "integration_test/lib" folder
• Fixes under "fix_data" will be in a folder structure mirroring the lib folder, but with "fix_" prefixes on the folder names
• Library level fixes will be directly under the "fix_data" folder, named "fix_<library_name>.yaml"
• Individual files will be made for each class that requires fixes, named "fix_<class_name>.yaml"
  • This may mean that a single code file will have multiple files for fixes.

Testing fixes

• Fixes will be required to be tested
• Tests will be under a new "test_fixes" folder
• The folder/file structure will mirror the "fix_data" folder, without the "fix_" prefixes
• Each file in "fix_data" will have a matching set of two files in "test_fixes" named "<library_name|class_name>.dart" and "<library_name|class_name>.dart.expect" where the ".dart" file is the pre-fix code and ".dart.expect" is the post-fix expectation.
• These tests will be run alongside the existing flutter fix tests by updating dev/bots/test.dart#_runFrameworkTests.runSlow to also run fix tests for the integration_test package