QtcProcess: Limit the inclusion of qtcprocess.h

Move the rest of QtcProcess enums to processenums.h.
Move ExitCodeInterpreter into processenums.h.
Remove superfluous Utils:: prefix.

Change-Id: Iaa596f353d33d6930085a621b114cc15a35caa80
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/mesonprojectmanager/project/ninjabuildstep.h

@@ -30,8 +30,6 @@
 #include <projectexplorer/abstractprocessstep.h>
 #include <projectexplorer/buildstep.h>
 
-#include <utils/qtcprocess.h>
-
 namespace MesonProjectManager {
 namespace Internal {