SACRAMENTO, Calif. — Nearly a half-million health workers who stand to benefit from California’s nation-leading $25 minimum wage law could be in for a rude awakening if hospitals and other health care providers follow through on potential cuts to hours and benefits. A medical industry challenge to a new minimum wage ordinance in one Southern California city suggests layoffs and reductions in hours and benefits, including cuts to premium pay and vacation time, could be one result of a state law set to begin phasing in in June. However, some experts are skeptical of that possibility. The Califor…