Ignore lauchSettings.json in test projects

This file is generated every time the solution is opened with Visual Studio but it is not a required file for an integration tests project

.gitignore

@@ -40,6 +40,7 @@ CorePlugins*/
 ProgramData-Server*/
 ProgramData-UI*/
 MediaBrowser.WebDashboard/jellyfin-web/**
+tests/**/launchSettings.json
 
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 ## Visual Studio