Observe ignoredUsersFlow to have live data about blocked user.

This will also ensure that blocking a user will work even if the user is not a member of the room (preparatory work for user permalink)

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/FakeMatrixClient.kt

@@ -48,6 +48,7 @@ import io.element.android.libraries.matrix.test.verification.FakeSessionVerifica
 import io.element.android.tests.testutils.simulateLongTask
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -205,6 +206,10 @@ class FakeMatrixClient(
         return RoomMembershipObserver()
     }
 
+    suspend fun emitIgnoreUserList(users: List<UserId>) {
+        ignoredUsersFlow.emit(users.toImmutableList())
+    }
+
     // Mocks
 
     fun givenLogoutError(failure: Throwable?) {