The majority of Bondi Pizza's Sydney restaurants have fallen into administration as difficulties that emerged during the COVID-19 pandemic continue to impact the chain.The eatery, which is owned by Casual Dining Concepts, has locations in Eastgardens, Randwick, Macquarie and Parramatta and is known for its thin and deep-dish styles of pizza.The restaurant is now facing trouble after all restaurants but Randwick, which opened most recently in Oc…