Soft logout removal (#672)

* Remove isSoftLogout from everywhere except the client delegate
- bump the RustSDK to v1.0.43
- cleanup the app coordinator state machine and login/logout flows

* Merge `succeededSigningIn` and `succeededRestoringSession` into `createdUserSession` in order to simplify the logic

ElementX/Sources/Services/Client/ClientProxyProtocol.swift

@@ -21,7 +21,6 @@ import MatrixRustSDK
 enum ClientProxyCallback {
     case receivedSyncUpdate
     case receivedAuthError(isSoftLogout: Bool)
-    case updatedRestoreToken
 }
 
 enum ClientProxyError: Error {
@@ -69,8 +68,6 @@ protocol ClientProxyProtocol: AnyObject, MediaLoaderProtocol {
     
     var userID: String { get }
 
-    var isSoftLogout: Bool { get }
-
     var deviceId: String? { get }
 
     var homeserver: String { get }