Min reads the allowed concurrency from r, compares it against ccy and returns the smaller value of the two.
A value of 1 is returned if r is unable to provide one.
type Reader interface {
// ReadAllowedCCY returns the allowed (max) concurrency for the current account. ReadAllowedCCY(ctx context.Context) (int, error)
}
Reader is the interface for retrieving account wide concurrency settings from Sauce Labs.