VcsCommand: Always install std callbacks

Do it also in fully synchronous case, as QtcProcess
is able to handle them even when EventLoopMode is off.

Change-Id: Ic24ff34e3d8808d2aaaf0300ba4ac95662e46d23
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/vcsbase/vcscommand.h

@@ -134,11 +134,6 @@ signals:
 private:
     void postRunCommand(const Utils::FilePath &workingDirectory);
 
-    // Run without a event loop in fully blocking mode. No signals will be delivered.
-    void runFullySynchronous(Utils::QtcProcess &proc);
-    // Run with an event loop. Signals will be delivered.
-    void runSynchronous(Utils::QtcProcess &proc);
-
     class Internal::VcsCommandPrivate *const d;
 };