blast_repo fixes (#1430) #1106

Job	Run time
analyzer_and_format; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_ser...	36s
mono_repo self validate	14s
analyzer_and_format; Dart 3.4.0; PKGS: _test_yaml, checked_yaml, example, json_annotation, json_s...	35s
unit_test; Dart 3.4.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/en...	47s
unit_test; Dart 3.4.0; PKG: json_serializable; `dart test -p chrome`	53s
unit_test; Dart 3.4.0; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/an...	2m 10s
unit_test; Dart 3.4.0; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	1m 0s
unit_test; Dart dev; PKGS: _test_yaml, checked_yaml, example, json_serializable; `dart test`	57s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/anno...	2m 2s
unit_test; Dart dev; PKG: json_serializable; `dart test --run-skipped -t presubmit-only test/ensu...	44s
unit_test; Dart dev; PKG: json_serializable; `dart test -p chrome`	49s
ensure_build; Dart 3.4.0; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pr...	1m 26s
ensure_build; Dart dev; PKGS: _test_yaml, checked_yaml, example; `dart test --run-skipped -t pres...	1m 23s
	13m 36s

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