Add threadInfo field to message like timeline events (#5930)

* Add `threadInfo` field to message like timeline events:
- Polls
- Stickers
- UTDs

* Add missing cases for `EventTimeline.threadInfo()`

features/poll/impl/src/test/kotlin/io/element/android/features/poll/impl/pollcontent/PollContentStateFactoryTest.kt

@@ -220,6 +220,7 @@ class PollContentStateFactoryTest {
         votes = votes,
         endTime = endTime,
         isEdited = false,
+        threadInfo = null,
     )
 
     private fun aPollContentState(