Can you explain if it's required to get bloodwork and a chest X-ray before a breast augmentation?

YES. Breast augmentation is major surgery and requires a general anesthetic. These risks are low, but it is not recommended to accept them for a cosmetic procedure that is not medically necessary. Sometimes we find significant medical conditions with these tests that end up being more important to the patient in the long term than the surgery itself. It is important to be safe.
Yes. Since it is a major surgery you need a cxr and blood work before you are put under anesthesia for your safety.