oracle should check for skipped tests too

[andre15silva]

gitbug-java/gitbug/bug.py

Lines 311 to 319 in 059f5af

	sys.exit(
	0
	if (
	len(runs) > 0
	and len(failed_tests) == 0
	and num_executed_tests == num_expected_executed_tests
	)
	else 1
	)

Currently, we only check for failing tests and the total number of tests. we also need to explicitly check for skipped tests, since agents can ignore tests.