Run core tests in Safari. Partially addresses https://github.com/pyodide/pyodide/issues/989

It runs, but there are several test failures, I'll open separate issues about those.
comment: false
codecov:
  branch: main
  require_ci_to_pass: false
  notify:
    wait_for_ci: false

comment: false
codecov:
  branch: main
  require_ci_to_pass: false
  notify:
    wait_for_ci: false
