run CTest in sanitizer jobs / added gui-tests CMake target

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The issue which made this unfeasible was fixed in #6691.

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WARNING: ThreadSanitizer: data race (pid=12373)
  Write of size 8 at 0x721800000148 by main thread:
    #0 pthread_cond_destroy <null> (test-filelist+0x6a480) (BuildId: 43eaac5f0ab7dba6f46cf07c94c39b7d31db1735)
    #1 QWaitCondition::~QWaitCondition() <null> (libQt6Core.so.6+0x335cf3) (BuildId: 5713ef80329ffaf3943ace9cbbaa9e57a283c071)
    #2 <null> <null> (libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
  Previous read of size 8 at 0x721800000148 by thread T1 (mutexes: write M0):
    #0 pthread_cond_broadcast <null> (test-filelist+0x6a2df) (BuildId: 43eaac5f0ab7dba6f46cf07c94c39b7d31db1735)
    #1 QWaitCondition::wakeAll() <null> (libQt6Core.so.6+0x335da9) (BuildId: 5713ef80329ffaf3943ace9cbbaa9e57a283c071)
  Location is heap block of size 96 at 0x721800000120 allocated by main thread:
    #0 operator new(unsigned long) <null> (test-filelist+0xec3b2) (BuildId: 43eaac5f0ab7dba6f46cf07c94c39b7d31db1735)
    #1 QWaitCondition::QWaitCondition() <null> (libQt6Core.so.6+0x335c58) (BuildId: 5713ef80329ffaf3943ace9cbbaa9e57a283c071)
    #2 <null> <null> (libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
  Mutex M0 (0x721800000120) created at:
    #0 pthread_mutex_init <null> (test-filelist+0x6a623) (BuildId: 43eaac5f0ab7dba6f46cf07c94c39b7d31db1735)
    #1 QWaitCondition::QWaitCondition() <null> (libQt6Core.so.6+0x335c65) (BuildId: 5713ef80329ffaf3943ace9cbbaa9e57a283c071)
    #2 <null> <null> (libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
  Thread T1 'QtTest Watchdog' (tid=12375, finished) created by main thread at:
    #0 pthread_create <null> (test-filelist+0x68c51) (BuildId: 43eaac5f0ab7dba6f46cf07c94c39b7d31db1735)
    #1 QThread::start(QThread::Priority) <null> (libQt6Core.so.6+0x328d1c) (BuildId: 5713ef80329ffaf3943ace9cbbaa9e57a283c071)
    #2 <null> <null> (libc.so.6+0x29d8f) (BuildId: 490fef8403240c91833978d494d39e537409b92e)
SUMMARY: ThreadSanitizer: data race (/home/runner/work/cppcheck/cppcheck/cmake.output/bin/test-filelist+0x6a480) (BuildId: 43eaac5f0ab7dba6f46cf07c94c39b7d31db1735) in pthread_cond_destroy

I filed https://trac.cppcheck.net/ticket/13355 about this (not sure if this actually a bug) and disabled CTest for the ThreadSanitizer job for now.