Stop using source_gen TypeChecker.fromRuntime. (#1517) #1357

Job	Run time
mono_repo self validate	14s
analyzer_and_format; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_ser...	28s
analyzer_and_format; Dart 3.8.0; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_s...	40s
unit_test; Dart 3.8.0; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	55s
unit_test; Dart 3.8.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/an...	2m 46s
unit_test; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	51s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/ensu...	43s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/anno...	2m 36s
unit_test; Dart 3.8.0; PKG: json_serializable; `dart test -p chrome`	1m 3s
unit_test; Dart 3.8.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/en...	47s
unit_test; Dart dev; PKG: json_serializable; `dart test -p chrome`	44s
ensure_build; Dart dev; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pres...	1m 14s
ensure_build; Dart 3.8.0; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pr...	1m 17s
	14m 18s

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