Is it permissible to pray with slight سلس (urinary incontinence/involuntary discharge) that does not reach the clothes, and what are the implications of the difficulty of performing istinja' (ritual cleansing after urination/defecation) in crowded workplaces, and is re-performing the prayer required later?

Avoiding impurities is a condition for the validity of prayer, provided one has knowledge and ability. Therefore, whoever knows there is an impurity on their body must remove it before prayer, unless they fear the prayer time will elapse. Performing prayer while able to cleanse oneself but failing to remove the impurity is invalid according to the majority of scholars. Some scholars hold the view that impurities that affect the body or clothing unintentionally are pardoned, and this opinion offers ease and latitude.