Fix memory leaks & data races in tests (#4772)

* Add a few pre-made sanitizer suppressions

* Test Sanitization: Fix threading issues

* Test Sanitization: Allow deletion of PubSub

We still don't delete it in main code, but this allows us to try
deleting it in tests.

* Test Sanitization: Fix some memory leaks

* fix gtest clang-tidy warning

* const emojis test :-)

tests/CMakeLists.txt

@@ -5,6 +5,7 @@ option(CHATTERINO_TEST_USE_PUBLIC_HTTPBIN "Use public httpbin for testing networ
 set(test_SOURCES
     ${CMAKE_CURRENT_LIST_DIR}/src/main.cpp
     ${CMAKE_CURRENT_LIST_DIR}/resources/test-resources.qrc
+    ${CMAKE_CURRENT_LIST_DIR}/src/TestHelpers.hpp
     ${CMAKE_CURRENT_LIST_DIR}/src/ChannelChatters.cpp
     ${CMAKE_CURRENT_LIST_DIR}/src/AccessGuard.cpp
     ${CMAKE_CURRENT_LIST_DIR}/src/NetworkCommon.cpp