PM-6685 Fix race condition issue where the biometrics check is being done before the iOS extension is being shown. So when we need the UI, we wait until ViewDidAppear happens. (#3078)

src/Core/Services/UserVerification/UserVerificationMediatorService.cs

@@ -39,7 +39,11 @@ namespace Bit.Core.Services.UserVerification
         {
             if (await ShouldPerformMasterPasswordRepromptAsync(options))
             {
-                options.OnNeedUI?.Invoke();
+                if (options.OnNeedUITask != null)
+                {
+                    await options.OnNeedUITask();
+                }
+
                 return await _passwordRepromptService.PromptAndCheckPasswordIfNeededAsync(Enums.CipherRepromptType.Password);
             }