Let AsyncAction.Confirming be an interface, with a AsyncAction.ConfirmingNoParams data object.

This will allow inheritance of `AsyncAction.Confirming` with parameter(s).

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/async/AsyncActionProvider.kt

@@ -14,7 +14,7 @@ open class AsyncActionProvider : PreviewParameterProvider<AsyncAction<Unit>> {
     override val values: Sequence<AsyncAction<Unit>>
         get() = sequenceOf(
             AsyncAction.Uninitialized,
-            AsyncAction.Confirming,
+            AsyncAction.ConfirmingNoParams,
             AsyncAction.Loading,
             AsyncAction.Failure(Exception("An error occurred")),
             AsyncAction.Success(Unit),

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/async/AsyncActionView.kt

@@ -42,7 +42,7 @@ fun <T> AsyncActionView(
 ) {
     when (async) {
         AsyncAction.Uninitialized -> Unit
-        AsyncAction.Confirming -> confirmationDialog()
+        is AsyncAction.Confirming -> confirmationDialog()
         is AsyncAction.Loading -> progressDialog()
         is AsyncAction.Failure -> {
             if (onRetry == null) {