feat: add skipped and staled conclusions #283

Job	Run time
test_based_job_failure	3s
test_based_job_success	3s
test_basic_action_required	5s
test_basic_cancelled	4s
test_basic_failure	5s
test_basic_skipped	3s
test_basic_neutral	5s
test_basic_success	5s
test_basic_stale	3s
test_basic_success_with_output	5s
test_basic_timed_out	4s
test_with_actions	4s
test_with_actions_from_run	4s
test_with_annotations	4s
test_with_annotations_from_run	3s
test_with_details	3s
test_with_images	3s
test_with_images_from_run	4s
test_with_init	33s
test_with_init_implicit	33s
	2m 16s

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