Tests

Spike implementation of `scip test` #179

Job	Run time
snapshots (dart3-features, 3.7.2)	38s
test	23s
consumer (Workiva/over_react)	1m 2s
snapshots (basic-project)	47s
snapshots (diagnostics)	40s
consumer (dart-lang/args, v2.4.2)	31s
consumer (Workiva/w_module)	53s
build / sbom	38s
checks / dependency-validator	23s
checks / format	42s
checks / check-release-notes	8s
checks / analyze	57s
checks / analyze-additional-checks	0s
checks / additional-checks	-1s
	7m 41s

Provide feedback