Is there any option to disable Attach, Stream, Praise and other apps?

mopatovsky 

It is possible to do nearly all of that in either the Team Admins global policy settings - https://docs.microsoft.com/en-us/MicrosoftTeams/teams-policies

Team owners can also lock down some of the things you mention at the Team level - https://support.office.com/en-us/article/Go-to-guide-for-team-owners-92d238e6-0ae2-447e-af90-40b1052c4547

You cannot disable the Files tab. Teams is just a wrapper for SharePoint, so it lives on SharePoint. Teams needs file access to function. 

With that said, nothing is stopping you from changing the permissions for the Teams Document Library to make it read-only. 

In chat, the Files tab is stored in OneDrive, and not SharePoint - so the users are sharing the files in their own file repository.