Allow to copy link to open conversation without joining it

* Search for an open conversation
* Try to copy a link to that conversation, without actually joining the conversation

Currently not possible, but it works on web, should try to do it on ios as well.

Reproduce the flow in the iOS app: search for an open conversation and try to copy its link without joining. Compare the behavior with the web version, then trace the iOS conversation search and link-copy flow. Done means an open conversation link can be copied without entering the conversation.

Written by the indexing model from the issue text.