[server & frontend]: add remove existing progresses when custom achievement is removed

[Darosss]

there is a problem with method in AchievementsHandler - updateUsersDisplayBadgesDependsOnRarity;
when custom achievement is removed it does not remove progresses at all

• need to add find and remove existing progresses connected to this custom achievements
• add this to frontend with warning that removing a custom achievement will remove all progresses too