Make tests more platform agnostic (#4650)

Use QTemporaryDir to create the test directory
Add option to use httpbin over local docker
Increase delay for opening a connection

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

benchmarks/src/Highlights.cpp

@@ -12,6 +12,7 @@
 #include <benchmark/benchmark.h>
 #include <QDebug>
 #include <QString>
+#include <QTemporaryDir>
 
 using namespace chatterino;
 
@@ -66,7 +67,8 @@ public:
 static void BM_HighlightTest(benchmark::State &state)
 {
     MockApplication mockApplication;
-    Settings settings("/tmp/c2-mock");
+    QTemporaryDir settingsDir;
+    Settings settings(settingsDir.path());
 
     std::string message =
         R"(@badge-info=subscriber/34;badges=moderator/1,subscriber/24;color=#FF0000;display-name=테스트계정420;emotes=41:6-13,15-22;flags=;id=a3196c7e-be4c-4b49-9c5a-8b8302b50c2a;mod=1;room-id=11148817;subscriber=1;tmi-sent-ts=1590922213730;turbo=0;user-id=117166826;user-type=mod :testaccount_420!testaccount_420@testaccount_420.tmi.twitch.tv PRIVMSG #pajlada :-tags Kreygasm,Kreygasm (no space))";