Improve the logs for TimelineException.CannotPaginate (#1708)

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/timeline/RustMatrixTimeline.kt

@@ -194,8 +194,12 @@ class RustMatrixTimeline(
                 waitForToken = true,
             )
             innerRoom.paginateBackwards(paginationOptions)
-        }.onFailure {
-            Timber.d(it, "Fail to paginate for room ${matrixRoom.roomId}")
+        }.onFailure { error ->
+            if (error is TimelineException.CannotPaginate) {
+                Timber.d("Can't paginate backwards on room ${matrixRoom.roomId}, we're already at the start")
+            } else {
+                Timber.e(error, "Error paginating backwards on room ${matrixRoom.roomId}")
+            }
         }.onSuccess {
             Timber.v("Success back paginating for room ${matrixRoom.roomId}")
         }