Add `lib/fix_data.yaml` for automatic migration with `dart fix`. #417

	name: Dart CI

	on:
	push:
	branches:
	- 'master'
	- 'test_consume_*'
	pull_request:
	branches:
	- '*'

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	sdk: [ 2.19.6, stable ]
	steps:
	- uses: actions/checkout@v4
	- uses: dart-lang/setup-dart@v1
	with:
	sdk: ${{ matrix.sdk }}
	- name: Install dependencies
	run: dart pub get
	- name: Validate dependencies
	run: dart run dependency_validator
	- name: Check formatting
	run: dart format --line-length=120 --output=none --set-exit-if-changed .
	if: ${{ matrix.sdk == 'stable' }}
	- name: Analyze project source
	run: dart analyze
	- name: Check Generated Fixtures Are Up-To-Date
	run: make gen-fixtures --check
	- name: Run tests
	run: make test-with-serve-remotes
	# TODO https://github.com/Workiva/json_schema/issues/184
	# When ^^^ is addressed, remove the --skip-validation flag here
	- name: Publish - dry run
	if: ${{ matrix.sdk == 'stable' }}
	run: dart pub publish --dry-run --skip-validation
	- name: Test 'dart fix'
	# if one of these tests stops working in a future Dart SDK, it may be
	# fine to keep entries in lib/fix_data.yaml and just remove the tests.
	run: dart fix --compare-to-golden test_fixes/

Provide feedback