The death of Merle Bonagua, a domestic worker from the Philippines who had worked for 18 years in Hong Kong, has highlighted the often daunting hurdles migrant workers face in getting health care in the city since the beginning of the coronavirus crisis, advocates and other domestic workers say.Bonagua, 52, died of ovarian cancer on September 20 at Queen Elizabeth Hospital in Yau Ma Tei. She was laid to rest this past week in her home country.Paul Saret, the head of the Philippine consulate’s…