UX: makes avatar non interactive in thread participants list (#23847)

It was slightly surprising to have a user card show when click on a thread item list.

More over this commit does:
- moves chat/user-avatar to chat-user-avatar and converts it to gjs
- moves chat/thread/participants to chat-thread-participants
- rewrite the `toggleCheckIfPossible` modifier to only be applied when selecting messages, it prevents the click event to collide with the click of avatars in regular messages

plugins/chat/spec/fabricators/chat_fabricator.rb

@@ -63,7 +63,7 @@ end
 Fabricator(:chat_message_without_service, class_name: "Chat::Message") do
   user
   chat_channel
-  message { Faker::Lorem.paragraph_by_chars(number: 500).gsub("...", "…") }
+  message { Faker::Lorem.paragraph_by_chars(number: 500).gsub("...", "…").gsub("..", "…") }
 
   after_build { |message, attrs| message.cook }
   after_create { |message, attrs| message.create_mentions }
@@ -90,7 +90,8 @@ Fabricator(:chat_message_with_service, class_name: "Chat::CreateMessage") do
       chat_channel_id: channel.id,
       guardian: user.guardian,
       message:
-        transients[:message] || Faker::Lorem.paragraph_by_chars(number: 500).gsub("...", "…"),
+        transients[:message] ||
+          Faker::Lorem.paragraph_by_chars(number: 500).gsub("...", "…").gsub("..", "…"),
       thread_id: transients[:thread]&.id,
       in_reply_to_id: transients[:in_reply_to]&.id,
       upload_ids: transients[:upload_ids],