The West Contra Costa Unified School District was expected to propose a COVID-19 vaccine mandate for students this week, but that was postponed indefinitely because of legal concerns, according to an email that Superintendent Chris Hurst sent to staff. Parents are split on whether students over 12 years old should be forced to get the vaccine, which the federal government has not yet approved for younger children. Some parents are concerned that kids could experience unexpected side effects, though studies…