ProjectExplorer: Remove unneeded #include in projectexplorer.h

And fix side effects.

Change-Id: Ib6f0c5618092f80204b409edec0a92004f2350d2
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/clangcodemodel/clangcodemodelplugin.cpp

@@ -55,6 +55,7 @@
 #include <texteditor/textmark.h>
 
 #include <utils/temporarydirectory.h>
+#include <utils/qtcassert.h>
 #include <utils/runextensions.h>
 
 using namespace Utils;