Add submodules support to `health.yaml` #815

Job	Run time
mono_repo self validate	18s
analyze_and_format; Dart dev; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, pkg...	32s
analyze_and_format; Dart 3.0.0; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, p...	31s
analyze_and_format; Dart dev; PKGS: pkgs/corpus, pkgs/dart_flutter_team_lints, pkgs/firehose, pkg...	25s
unit_test; Dart dev; PKG: pkgs/corpus; `dart test`	37s
unit_test; Dart 3.0.0; PKG: pkgs/firehose; `dart test`	27s
unit_test; Dart 3.0.0; PKG: pkgs/corpus; `dart test`	42s
unit_test; Dart 3.0.0; PKG: pkgs/dart_flutter_team_lints; `dart test`	24s
unit_test; Dart dev; PKG: pkgs/dart_flutter_team_lints; `dart test`	21s
unit_test; Dart dev; PKG: pkgs/firehose; `dart test`	25s
analyze_format; Dart dev; PKG: pkgs/blast_repo; `dart format --output=none --set-exit-if-changed ...	19s
test; Dart dev; PKG: pkgs/blast_repo; `dart test --test-randomize-ordering-seed=random`	23s
	5m 24s

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