Target specification (testset name or 'all')
Optionalmodifier: stringOptional modifier (group name or test index)
// From CLI: polyman validate --all
await validateTestsAction('all');
// Validates all testsets
// From CLI: polyman validate --testset tests
await validateTestsAction('testsets');
// Validates testset named 'testsets'
Validates test input files using the validator program. Supports validation by testset, group, or single test.