remove discovery user new and discovery user usages #3509

Summary

we've used the ChannelListItem instead of custom implementations across the app. And removed whatever became deprecated. There are some slight UI changes

Testing Considerations

• search results
• search results in discovery (click search, enter, select the channels tab)
• group members list item (and functionality like admin button etc.)
• blocked channel screen
• blocked channels list item in settings

Regression Scope

all screens the above components are used

Platform Affected (web, mobile, etc)

cross

Developer Testing Completed

y

Screenshots