Fix leaving the room not always dismissing the room screen (#5089)

* Fix leaving the room not always dismissing the room screen

Use the existing `RoomInfo` membership check to dismiss the room instead of using `RoomMembershipObserver`.

* Restore `membershipObserver`, check Maestro still works

* Improve the logic for the local membership change check

* Remove redundant room id check

libraries/core/src/main/kotlin/io/element/android/libraries/core/coroutine/Flow.kt

@@ -8,7 +8,9 @@
 package io.element.android.libraries.core.coroutine
 
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.runningFold
 
 /**
  * Returns the first element of the flow that is an instance of [T], waiting for it if necessary.
@@ -16,3 +18,14 @@ import kotlinx.coroutines.flow.first
 suspend inline fun <reified T> Flow<*>.firstInstanceOf(): T {
     return first { it is T } as T
 }
+
+/**
+ * Returns a flow that emits pairs of the previous and current values.
+ * The first emission will be a pair of `null` and the first value emitted by the source flow.
+ */
+fun <T> Flow<T>.withPreviousValue(): Flow<Pair<T?, T>> {
+    return runningFold(null) { prev: Pair<T?, T>?, current ->
+        prev?.second to current
+    }
+        .filterNotNull()
+}